// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// This is CodeMirror (https://codemirror.net), a code editor
// implemented in JavaScript on top of the browser's DOM.
//
// You can find some technical background for some of the code below
// at http://marijnhaverbeke.nl/blog/#cm-internals .
layui.define(["jquery"], function (exports) {
    var jQuery = layui.jquery;
    (function ($) {
        (function (global, factory) {
            typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
                typeof define === 'function' && define.amd ? define(factory) :
                    (global.CodeMirror = factory());
        }(this, (function () {
            'use strict';

            // Kludges for bugs and behavior differences that can't be feature
            // detected are enabled based on userAgent etc sniffing.
            var userAgent = navigator.userAgent;
            var platform = navigator.platform;

            var gecko = /gecko\/\d/i.test(userAgent);
            var ie_upto10 = /MSIE \d/.test(userAgent);
            var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
            var edge = /Edge\/(\d+)/.exec(userAgent);
            var ie = ie_upto10 || ie_11up || edge;
            var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
            var webkit = !edge && /WebKit\//.test(userAgent);
            var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
            var chrome = !edge && /Chrome\//.test(userAgent);
            var presto = /Opera\//.test(userAgent);
            var safari = /Apple Computer/.test(navigator.vendor);
            var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
            var phantom = /PhantomJS/.test(userAgent);

            var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent);
            var android = /Android/.test(userAgent);
            // This is woefully incomplete. Suggestions for alternative methods welcome.
            var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
            var mac = ios || /Mac/.test(platform);
            var chromeOS = /\bCrOS\b/.test(userAgent);
            var windows = /win/i.test(platform);

            var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
            if (presto_version) {
                presto_version = Number(presto_version[1]);
            }
            if (presto_version && presto_version >= 15) {
                presto = false;
                webkit = true;
            }
            // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
            var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
            var captureRightClick = gecko || (ie && ie_version >= 9);

            function classTest(cls) {
                return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*")
            }

            var rmClass = function (node, cls) {
                var current = node.className;
                var match = classTest(cls).exec(current);
                if (match) {
                    var after = current.slice(match.index + match[0].length);
                    node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
                }
            };

            function removeChildren(e) {
                for (var count = e.childNodes.length; count > 0; --count) {
                    e.removeChild(e.firstChild);
                }
                return e
            }

            function removeChildrenAndAdd(parent, e) {
                return removeChildren(parent).appendChild(e)
            }

            function elt(tag, content, className, style) {
                var e = document.createElement(tag);
                if (className) {
                    e.className = className;
                }
                if (style) {
                    e.style.cssText = style;
                }
                if (typeof content == "string") {
                    e.appendChild(document.createTextNode(content));
                } else if (content) {
                    for (var i = 0; i < content.length; ++i) {
                        e.appendChild(content[i]);
                    }
                }
                return e
            }

            // wrapper for elt, which removes the elt from the accessibility tree
            function eltP(tag, content, className, style) {
                var e = elt(tag, content, className, style);
                e.setAttribute("role", "presentation");
                return e
            }

            var range;
            if (document.createRange) {
                range = function (node, start, end, endNode) {
                    var r = document.createRange();
                    r.setEnd(endNode || node, end);
                    r.setStart(node, start);
                    return r
                };
            } else {
                range = function (node, start, end) {
                    var r = document.body.createTextRange();
                    try {
                        r.moveToElementText(node.parentNode);
                    } catch (e) {
                        return r
                    }
                    r.collapse(true);
                    r.moveEnd("character", end);
                    r.moveStart("character", start);
                    return r
                };
            }

            function contains(parent, child) {
                if (child.nodeType == 3) // Android browser always returns false when child is a textnode
                {
                    child = child.parentNode;
                }
                if (parent.contains) {
                    return parent.contains(child)
                }
                do {
                    if (child.nodeType == 11) {
                        child = child.host;
                    }
                    if (child == parent) {
                        return true
                    }
                } while (child = child.parentNode)
            }

            function activeElt() {
                // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
                // IE < 10 will throw when accessed while the page is loading or in an iframe.
                // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
                var activeElement;
                try {
                    activeElement = document.activeElement;
                } catch (e) {
                    activeElement = document.body || null;
                }
                while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement) {
                    activeElement = activeElement.shadowRoot.activeElement;
                }
                return activeElement
            }

            function addClass(node, cls) {
                var current = node.className;
                if (!classTest(cls).test(current)) {
                    node.className += (current ? " " : "") + cls;
                }
            }

            function joinClasses(a, b) {
                var as = a.split(" ");
                for (var i = 0; i < as.length; i++) {
                    if (as[i] && !classTest(as[i]).test(b)) {
                        b += " " + as[i];
                    }
                }
                return b
            }

            var selectInput = function (node) {
                node.select();
            };
            if (ios) // Mobile Safari apparently has a bug where select() is broken.
            {
                selectInput = function (node) {
                    node.selectionStart = 0;
                    node.selectionEnd = node.value.length;
                };
            } else if (ie) // Suppress mysterious IE10 errors
            {
                selectInput = function (node) {
                    try {
                        node.select();
                    } catch (_e) {
                    }
                };
            }

            function bind(f) {
                var args = Array.prototype.slice.call(arguments, 1);
                return function () {
                    return f.apply(null, args)
                }
            }

            function copyObj(obj, target, overwrite) {
                if (!target) {
                    target = {};
                }
                for (var prop in obj) {
                    if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop))) {
                        target[prop] = obj[prop];
                    }
                }
                return target
            }

            // Counts the column offset in a string, taking tabs into account.
            // Used mostly to find indentation.
            function countColumn(string, end, tabSize, startIndex, startValue) {
                if (end == null) {
                    end = string.search(/[^\s\u00a0]/);
                    if (end == -1) {
                        end = string.length;
                    }
                }
                for (var i = startIndex || 0, n = startValue || 0; ;) {
                    var nextTab = string.indexOf("\t", i);
                    if (nextTab < 0 || nextTab >= end) {
                        return n + (end - i)
                    }
                    n += nextTab - i;
                    n += tabSize - (n % tabSize);
                    i = nextTab + 1;
                }
            }

            var Delayed = function () {
                this.id = null;
            };
            Delayed.prototype.set = function (ms, f) {
                clearTimeout(this.id);
                this.id = setTimeout(f, ms);
            };

            function indexOf(array, elt) {
                for (var i = 0; i < array.length; ++i) {
                    if (array[i] == elt) {
                        return i
                    }
                }
                return -1
            }

            // Number of pixels added to scroller and sizer to hide scrollbar
            var scrollerGap = 30;

            // Returned or thrown by various protocols to signal 'I'm not
            // handling this'.
            var Pass = {
                toString: function () {
                    return "CodeMirror.Pass"
                }
            };

            // Reused option objects for setSelection & friends
            var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};

            // The inverse of countColumn -- find the offset that corresponds to
            // a particular column.
            function findColumn(string, goal, tabSize) {
                for (var pos = 0, col = 0; ;) {
                    var nextTab = string.indexOf("\t", pos);
                    if (nextTab == -1) {
                        nextTab = string.length;
                    }
                    var skipped = nextTab - pos;
                    if (nextTab == string.length || col + skipped >= goal) {
                        return pos + Math.min(skipped, goal - col)
                    }
                    col += nextTab - pos;
                    col += tabSize - (col % tabSize);
                    pos = nextTab + 1;
                    if (col >= goal) {
                        return pos
                    }
                }
            }

            var spaceStrs = [""];

            function spaceStr(n) {
                while (spaceStrs.length <= n) {
                    spaceStrs.push(lst(spaceStrs) + " ");
                }
                return spaceStrs[n]
            }

            function lst(arr) {
                return arr[arr.length - 1]
            }

            function map(array, f) {
                var out = [];
                for (var i = 0; i < array.length; i++) {
                    out[i] = f(array[i], i);
                }
                return out
            }

            function insertSorted(array, value, score) {
                var pos = 0, priority = score(value);
                while (pos < array.length && score(array[pos]) <= priority) {
                    pos++;
                }
                array.splice(pos, 0, value);
            }

            function nothing() {
            }

            function createObj(base, props) {
                var inst;
                if (Object.create) {
                    inst = Object.create(base);
                } else {
                    nothing.prototype = base;
                    inst = new nothing();
                }
                if (props) {
                    copyObj(props, inst);
                }
                return inst
            }

            var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;

            function isWordCharBasic(ch) {
                return /\w/.test(ch) || ch > "\x80" &&
                    (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
            }

            function isWordChar(ch, helper) {
                if (!helper) {
                    return isWordCharBasic(ch)
                }
                if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) {
                    return true
                }
                return helper.test(ch)
            }

            function isEmpty(obj) {
                for (var n in obj) {
                    if (obj.hasOwnProperty(n) && obj[n]) {
                        return false
                    }
                }
                return true
            }

            // Extending unicode characters. A series of a non-extending char +
            // any number of extending chars is treated as a single unit as far
            // as editing and measuring is concerned. This is not fully correct,
            // since some scripts/fonts/browsers also treat other configurations
            // of code points as a group.
            var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;

            function isExtendingChar(ch) {
                return ch.charCodeAt(0) >= 768 && extendingChars.test(ch)
            }

            // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
            function skipExtendingChars(str, pos, dir) {
                while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) {
                    pos += dir;
                }
                return pos
            }

            // Returns the value from the range [`from`; `to`] that satisfies
            // `pred` and is closest to `from`. Assumes that at least `to`
            // satisfies `pred`. Supports `from` being greater than `to`.
            function findFirst(pred, from, to) {
                // At any point we are certain `to` satisfies `pred`, don't know
                // whether `from` does.
                var dir = from > to ? -1 : 1;
                for (; ;) {
                    if (from == to) {
                        return from
                    }
                    var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
                    if (mid == from) {
                        return pred(mid) ? from : to
                    }
                    if (pred(mid)) {
                        to = mid;
                    } else {
                        from = mid + dir;
                    }
                }
            }

            // The display handles the DOM integration, both for input reading
            // and content drawing. It holds references to DOM nodes and
            // display-related state.

            function Display(place, doc, input) {
                var d = this;
                this.input = input;

                // Covers bottom-right square when both scrollbars are present.
                d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
                d.scrollbarFiller.setAttribute("cm-not-content", "true");
                // Covers bottom of gutter when coverGutterNextToScrollbar is on
                // and h scrollbar is present.
                d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
                d.gutterFiller.setAttribute("cm-not-content", "true");
                // Will contain the actual code, positioned to cover the viewport.
                d.lineDiv = eltP("div", null, "CodeMirror-code");
                // Elements are added to these to represent selection and cursors.
                d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
                d.cursorDiv = elt("div", null, "CodeMirror-cursors");
                // A visibility: hidden element used to find the size of things.
                d.measure = elt("div", null, "CodeMirror-measure");
                // When lines outside of the viewport are measured, they are drawn in this.
                d.lineMeasure = elt("div", null, "CodeMirror-measure");
                // Wraps everything that needs to exist inside the vertically-padded coordinate system
                d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
                    null, "position: relative; outline: none");
                var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
                // Moved around its parent to cover visible view.
                d.mover = elt("div", [lines], null, "position: relative");
                // Set to the height of the document, allowing scrolling.
                d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
                d.sizerWidth = null;
                // Behavior of elts with overflow: auto and padding is
                // inconsistent across browsers. This is used to ensure the
                // scrollable area is big enough.
                d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
                // Will contain the gutters, if any.
                d.gutters = elt("div", null, "CodeMirror-gutters");
                d.lineGutter = null;
                // Actual scrollable element.
                d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
                d.scroller.setAttribute("tabIndex", "-1");
                // The element in which the editor lives.
                d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

                // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
                if (ie && ie_version < 8) {
                    d.gutters.style.zIndex = -1;
                    d.scroller.style.paddingRight = 0;
                }
                if (!webkit && !(gecko && mobile)) {
                    d.scroller.draggable = true;
                }

                if (place) {
                    if (place.appendChild) {
                        place.appendChild(d.wrapper);
                    } else {
                        place(d.wrapper);
                    }
                }

                // Current rendered range (may be bigger than the view window).
                d.viewFrom = d.viewTo = doc.first;
                d.reportedViewFrom = d.reportedViewTo = doc.first;
                // Information about the rendered lines.
                d.view = [];
                d.renderedView = null;
                // Holds info about a single rendered line when it was rendered
                // for measurement, while not in view.
                d.externalMeasured = null;
                // Empty space (in pixels) above the view
                d.viewOffset = 0;
                d.lastWrapHeight = d.lastWrapWidth = 0;
                d.updateLineNumbers = null;

                d.nativeBarWidth = d.barHeight = d.barWidth = 0;
                d.scrollbarsClipped = false;

                // Used to only resize the line number gutter when necessary (when
                // the amount of lines crosses a boundary that makes its width change)
                d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
                // Set to true when a non-horizontal-scrolling line widget is
                // added. As an optimization, line widget aligning is skipped when
                // this is false.
                d.alignWidgets = false;

                d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

                // Tracks the maximum line length so that the horizontal scrollbar
                // can be kept static when scrolling.
                d.maxLine = null;
                d.maxLineLength = 0;
                d.maxLineChanged = false;

                // Used for measuring wheel scrolling granularity
                d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

                // True when shift is held down.
                d.shift = false;

                // Used to track whether anything happened since the context menu
                // was opened.
                d.selForContextMenu = null;

                d.activeTouch = null;

                input.init(d);
            }

            // Find the line object corresponding to the given line number.
            function getLine(doc, n) {
                n -= doc.first;
                if (n < 0 || n >= doc.size) {
                    throw new Error("There is no line " + (n + doc.first) + " in the document.")
                }
                var chunk = doc;
                while (!chunk.lines) {
                    for (var i = 0; ; ++i) {
                        var child = chunk.children[i], sz = child.chunkSize();
                        if (n < sz) {
                            chunk = child;
                            break
                        }
                        n -= sz;
                    }
                }
                return chunk.lines[n]
            }

            // Get the part of a document between two positions, as an array of
            // strings.
            function getBetween(doc, start, end) {
                var out = [], n = start.line;
                doc.iter(start.line, end.line + 1, function (line) {
                    var text = line.text;
                    if (n == end.line) {
                        text = text.slice(0, end.ch);
                    }
                    if (n == start.line) {
                        text = text.slice(start.ch);
                    }
                    out.push(text);
                    ++n;
                });
                return out
            }

            // Get the lines between from and to, as array of strings.
            function getLines(doc, from, to) {
                var out = [];
                doc.iter(from, to, function (line) {
                    out.push(line.text);
                }); // iter aborts when callback returns truthy value
                return out
            }

            // Update the height of a line, propagating the height change
            // upwards to parent nodes.
            function updateLineHeight(line, height) {
                var diff = height - line.height;
                if (diff) {
                    for (var n = line; n; n = n.parent) {
                        n.height += diff;
                    }
                }
            }

            // Given a line object, find its line number by walking up through
            // its parent links.
            function lineNo(line) {
                if (line.parent == null) {
                    return null
                }
                var cur = line.parent, no = indexOf(cur.lines, line);
                for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
                    for (var i = 0; ; ++i) {
                        if (chunk.children[i] == cur) {
                            break
                        }
                        no += chunk.children[i].chunkSize();
                    }
                }
                return no + cur.first
            }

            // Find the line at the given vertical position, using the height
            // information in the document tree.
            function lineAtHeight(chunk, h) {
                var n = chunk.first;
                outer: do {
                    for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
                        var child = chunk.children[i$1], ch = child.height;
                        if (h < ch) {
                            chunk = child;
                            continue outer
                        }
                        h -= ch;
                        n += child.chunkSize();
                    }
                    return n
                } while (!chunk.lines)
                var i = 0;
                for (; i < chunk.lines.length; ++i) {
                    var line = chunk.lines[i], lh = line.height;
                    if (h < lh) {
                        break
                    }
                    h -= lh;
                }
                return n + i
            }

            function isLine(doc, l) {
                return l >= doc.first && l < doc.first + doc.size
            }

            function lineNumberFor(options, i) {
                return String(options.lineNumberFormatter(i + options.firstLineNumber))
            }

            // A Pos instance represents a position within the text.
            function Pos(line, ch, sticky) {
                if (sticky === void 0) sticky = null;

                if (!(this instanceof Pos)) {
                    return new Pos(line, ch, sticky)
                }
                this.line = line;
                this.ch = ch;
                this.sticky = sticky;
            }

            // Compare two positions, return 0 if they are the same, a negative
            // number when a is less, and a positive number otherwise.
            function cmp(a, b) {
                return a.line - b.line || a.ch - b.ch
            }

            function equalCursorPos(a, b) {
                return a.sticky == b.sticky && cmp(a, b) == 0
            }

            function copyPos(x) {
                return Pos(x.line, x.ch)
            }

            function maxPos(a, b) {
                return cmp(a, b) < 0 ? b : a
            }

            function minPos(a, b) {
                return cmp(a, b) < 0 ? a : b
            }

            // Most of the external API clips given positions to make sure they
            // actually exist within the document.
            function clipLine(doc, n) {
                return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))
            }

            function clipPos(doc, pos) {
                if (pos.line < doc.first) {
                    return Pos(doc.first, 0)
                }
                var last = doc.first + doc.size - 1;
                if (pos.line > last) {
                    return Pos(last, getLine(doc, last).text.length)
                }
                return clipToLen(pos, getLine(doc, pos.line).text.length)
            }

            function clipToLen(pos, linelen) {
                var ch = pos.ch;
                if (ch == null || ch > linelen) {
                    return Pos(pos.line, linelen)
                } else if (ch < 0) {
                    return Pos(pos.line, 0)
                } else {
                    return pos
                }
            }

            function clipPosArray(doc, array) {
                var out = [];
                for (var i = 0; i < array.length; i++) {
                    out[i] = clipPos(doc, array[i]);
                }
                return out
            }

            // Optimize some code when these features are not used.
            var sawReadOnlySpans = false, sawCollapsedSpans = false;

            function seeReadOnlySpans() {
                sawReadOnlySpans = true;
            }

            function seeCollapsedSpans() {
                sawCollapsedSpans = true;
            }

            // TEXTMARKER SPANS

            function MarkedSpan(marker, from, to) {
                this.marker = marker;
                this.from = from;
                this.to = to;
            }

            // Search an array of spans for a span matching the given marker.
            function getMarkedSpanFor(spans, marker) {
                if (spans) {
                    for (var i = 0; i < spans.length; ++i) {
                        var span = spans[i];
                        if (span.marker == marker) {
                            return span
                        }
                    }
                }
            }

            // Remove a span from an array, returning undefined if no spans are
            // left (we don't store arrays for lines without spans).
            function removeMarkedSpan(spans, span) {
                var r;
                for (var i = 0; i < spans.length; ++i) {
                    if (spans[i] != span) {
                        (r || (r = [])).push(spans[i]);
                    }
                }
                return r
            }

            // Add a span to a line.
            function addMarkedSpan(line, span) {
                line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
                span.marker.attachLine(line);
            }

            // Used for the algorithm that adjusts markers for a change in the
            // document. These functions cut an array of spans at a given
            // character position, returning an array of remaining chunks (or
            // undefined if nothing remains).
            function markedSpansBefore(old, startCh, isInsert) {
                var nw;
                if (old) {
                    for (var i = 0; i < old.length; ++i) {
                        var span = old[i], marker = span.marker;
                        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
                        if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
                            var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)
                            ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
                        }
                    }
                }
                return nw
            }

            function markedSpansAfter(old, endCh, isInsert) {
                var nw;
                if (old) {
                    for (var i = 0; i < old.length; ++i) {
                        var span = old[i], marker = span.marker;
                        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
                        if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
                            var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)
                            ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
                                span.to == null ? null : span.to - endCh));
                        }
                    }
                }
                return nw
            }

            // Given a change object, compute the new set of marker spans that
            // cover the line in which the change took place. Removes spans
            // entirely within the change, reconnects spans belonging to the
            // same marker that appear on both sides of the change, and cuts off
            // spans partially within the change. Returns an array of span
            // arrays with one element for each line in (after) the change.
            function stretchSpansOverChange(doc, change) {
                if (change.full) {
                    return null
                }
                var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
                var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
                if (!oldFirst && !oldLast) {
                    return null
                }

                var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
                // Get the spans that 'stick out' on both sides
                var first = markedSpansBefore(oldFirst, startCh, isInsert);
                var last = markedSpansAfter(oldLast, endCh, isInsert);

                // Next, merge those two ends
                var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
                if (first) {
                    // Fix up .to properties of first
                    for (var i = 0; i < first.length; ++i) {
                        var span = first[i];
                        if (span.to == null) {
                            var found = getMarkedSpanFor(last, span.marker);
                            if (!found) {
                                span.to = startCh;
                            } else if (sameLine) {
                                span.to = found.to == null ? null : found.to + offset;
                            }
                        }
                    }
                }
                if (last) {
                    // Fix up .from in last (or move them into first in case of sameLine)
                    for (var i$1 = 0; i$1 < last.length; ++i$1) {
                        var span$1 = last[i$1];
                        if (span$1.to != null) {
                            span$1.to += offset;
                        }
                        if (span$1.from == null) {
                            var found$1 = getMarkedSpanFor(first, span$1.marker);
                            if (!found$1) {
                                span$1.from = offset;
                                if (sameLine) {
                                    (first || (first = [])).push(span$1);
                                }
                            }
                        } else {
                            span$1.from += offset;
                            if (sameLine) {
                                (first || (first = [])).push(span$1);
                            }
                        }
                    }
                }
                // Make sure we didn't create any zero-length spans
                if (first) {
                    first = clearEmptySpans(first);
                }
                if (last && last != first) {
                    last = clearEmptySpans(last);
                }

                var newMarkers = [first];
                if (!sameLine) {
                    // Fill gap with whole-line-spans
                    var gap = change.text.length - 2, gapMarkers;
                    if (gap > 0 && first) {
                        for (var i$2 = 0; i$2 < first.length; ++i$2) {
                            if (first[i$2].to == null) {
                                (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null));
                            }
                        }
                    }
                    for (var i$3 = 0; i$3 < gap; ++i$3) {
                        newMarkers.push(gapMarkers);
                    }
                    newMarkers.push(last);
                }
                return newMarkers
            }

            // Remove spans that are empty and don't have a clearWhenEmpty
            // option of false.
            function clearEmptySpans(spans) {
                for (var i = 0; i < spans.length; ++i) {
                    var span = spans[i];
                    if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false) {
                        spans.splice(i--, 1);
                    }
                }
                if (!spans.length) {
                    return null
                }
                return spans
            }

            // Used to 'clip' out readOnly ranges when making a change.
            function removeReadOnlyRanges(doc, from, to) {
                var markers = null;
                doc.iter(from.line, to.line + 1, function (line) {
                    if (line.markedSpans) {
                        for (var i = 0; i < line.markedSpans.length; ++i) {
                            var mark = line.markedSpans[i].marker;
                            if (mark.readOnly && (!markers || indexOf(markers, mark) == -1)) {
                                (markers || (markers = [])).push(mark);
                            }
                        }
                    }
                });
                if (!markers) {
                    return null
                }
                var parts = [{from: from, to: to}];
                for (var i = 0; i < markers.length; ++i) {
                    var mk = markers[i], m = mk.find(0);
                    for (var j = 0; j < parts.length; ++j) {
                        var p = parts[j];
                        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) {
                            continue
                        }
                        var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
                        if (dfrom < 0 || !mk.inclusiveLeft && !dfrom) {
                            newParts.push({from: p.from, to: m.from});
                        }
                        if (dto > 0 || !mk.inclusiveRight && !dto) {
                            newParts.push({from: m.to, to: p.to});
                        }
                        parts.splice.apply(parts, newParts);
                        j += newParts.length - 3;
                    }
                }
                return parts
            }

            // Connect or disconnect spans from a line.
            function detachMarkedSpans(line) {
                var spans = line.markedSpans;
                if (!spans) {
                    return
                }
                for (var i = 0; i < spans.length; ++i) {
                    spans[i].marker.detachLine(line);
                }
                line.markedSpans = null;
            }

            function attachMarkedSpans(line, spans) {
                if (!spans) {
                    return
                }
                for (var i = 0; i < spans.length; ++i) {
                    spans[i].marker.attachLine(line);
                }
                line.markedSpans = spans;
            }

            // Helpers used when computing which overlapping collapsed span
            // counts as the larger one.
            function extraLeft(marker) {
                return marker.inclusiveLeft ? -1 : 0
            }

            function extraRight(marker) {
                return marker.inclusiveRight ? 1 : 0
            }

            // Returns a number indicating which of two overlapping collapsed
            // spans is larger (and thus includes the other). Falls back to
            // comparing ids when the spans cover exactly the same range.
            function compareCollapsedMarkers(a, b) {
                var lenDiff = a.lines.length - b.lines.length;
                if (lenDiff != 0) {
                    return lenDiff
                }
                var aPos = a.find(), bPos = b.find();
                var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
                if (fromCmp) {
                    return -fromCmp
                }
                var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
                if (toCmp) {
                    return toCmp
                }
                return b.id - a.id
            }

            // Find out whether a line ends or starts in a collapsed span. If
            // so, return the marker for that span.
            function collapsedSpanAtSide(line, start) {
                var sps = sawCollapsedSpans && line.markedSpans, found;
                if (sps) {
                    for (var sp = (void 0), i = 0; i < sps.length; ++i) {
                        sp = sps[i];
                        if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
                            (!found || compareCollapsedMarkers(found, sp.marker) < 0)) {
                            found = sp.marker;
                        }
                    }
                }
                return found
            }

            function collapsedSpanAtStart(line) {
                return collapsedSpanAtSide(line, true)
            }

            function collapsedSpanAtEnd(line) {
                return collapsedSpanAtSide(line, false)
            }

            function collapsedSpanAround(line, ch) {
                var sps = sawCollapsedSpans && line.markedSpans, found;
                if (sps) {
                    for (var i = 0; i < sps.length; ++i) {
                        var sp = sps[i];
                        if (sp.marker.collapsed && (sp.from == null || sp.from < ch) && (sp.to == null || sp.to > ch) &&
                            (!found || compareCollapsedMarkers(found, sp.marker) < 0)) {
                            found = sp.marker;
                        }
                    }
                }
                return found
            }

            // Test whether there exists a collapsed span that partially
            // overlaps (covers the start or end, but not both) of a new span.
            // Such overlap is not allowed.
            function conflictingCollapsedRange(doc, lineNo$$1, from, to, marker) {
                var line = getLine(doc, lineNo$$1);
                var sps = sawCollapsedSpans && line.markedSpans;
                if (sps) {
                    for (var i = 0; i < sps.length; ++i) {
                        var sp = sps[i];
                        if (!sp.marker.collapsed) {
                            continue
                        }
                        var found = sp.marker.find(0);
                        var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
                        var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
                        if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) {
                            continue
                        }
                        if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
                            fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0)) {
                            return true
                        }
                    }
                }
            }

            // A visual line is a line as drawn on the screen. Folding, for
            // example, can cause multiple logical lines to appear on the same
            // visual line. This finds the start of the visual line that the
            // given line is part of (usually that is the line itself).
            function visualLine(line) {
                var merged;
                while (merged = collapsedSpanAtStart(line)) {
                    line = merged.find(-1, true).line;
                }
                return line
            }

            function visualLineEnd(line) {
                var merged;
                while (merged = collapsedSpanAtEnd(line)) {
                    line = merged.find(1, true).line;
                }
                return line
            }

            // Returns an array of logical lines that continue the visual line
            // started by the argument, or undefined if there are no such lines.
            function visualLineContinued(line) {
                var merged, lines;
                while (merged = collapsedSpanAtEnd(line)) {
                    line = merged.find(1, true).line
                    ;(lines || (lines = [])).push(line);
                }
                return lines
            }

            // Get the line number of the start of the visual line that the
            // given line number is part of.
            function visualLineNo(doc, lineN) {
                var line = getLine(doc, lineN), vis = visualLine(line);
                if (line == vis) {
                    return lineN
                }
                return lineNo(vis)
            }

            // Get the line number of the start of the next visual line after
            // the given line.
            function visualLineEndNo(doc, lineN) {
                if (lineN > doc.lastLine()) {
                    return lineN
                }
                var line = getLine(doc, lineN), merged;
                if (!lineIsHidden(doc, line)) {
                    return lineN
                }
                while (merged = collapsedSpanAtEnd(line)) {
                    line = merged.find(1, true).line;
                }
                return lineNo(line) + 1
            }

            // Compute whether a line is hidden. Lines count as hidden when they
            // are part of a visual line that starts with another line, or when
            // they are entirely covered by collapsed, non-widget span.
            function lineIsHidden(doc, line) {
                var sps = sawCollapsedSpans && line.markedSpans;
                if (sps) {
                    for (var sp = (void 0), i = 0; i < sps.length; ++i) {
                        sp = sps[i];
                        if (!sp.marker.collapsed) {
                            continue
                        }
                        if (sp.from == null) {
                            return true
                        }
                        if (sp.marker.widgetNode) {
                            continue
                        }
                        if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp)) {
                            return true
                        }
                    }
                }
            }

            function lineIsHiddenInner(doc, line, span) {
                if (span.to == null) {
                    var end = span.marker.find(1, true);
                    return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
                }
                if (span.marker.inclusiveRight && span.to == line.text.length) {
                    return true
                }
                for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
                    sp = line.markedSpans[i];
                    if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
                        (sp.to == null || sp.to != span.from) &&
                        (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
                        lineIsHiddenInner(doc, line, sp)) {
                        return true
                    }
                }
            }

            // Find the height above the given line.
            function heightAtLine(lineObj) {
                lineObj = visualLine(lineObj);

                var h = 0, chunk = lineObj.parent;
                for (var i = 0; i < chunk.lines.length; ++i) {
                    var line = chunk.lines[i];
                    if (line == lineObj) {
                        break
                    } else {
                        h += line.height;
                    }
                }
                for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
                    for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
                        var cur = p.children[i$1];
                        if (cur == chunk) {
                            break
                        } else {
                            h += cur.height;
                        }
                    }
                }
                return h
            }

            // Compute the character length of a line, taking into account
            // collapsed ranges (see markText) that might hide parts, and join
            // other lines onto it.
            function lineLength(line) {
                if (line.height == 0) {
                    return 0
                }
                var len = line.text.length, merged, cur = line;
                while (merged = collapsedSpanAtStart(cur)) {
                    var found = merged.find(0, true);
                    cur = found.from.line;
                    len += found.from.ch - found.to.ch;
                }
                cur = line;
                while (merged = collapsedSpanAtEnd(cur)) {
                    var found$1 = merged.find(0, true);
                    len -= cur.text.length - found$1.from.ch;
                    cur = found$1.to.line;
                    len += cur.text.length - found$1.to.ch;
                }
                return len
            }

            // Find the longest line in the document.
            function findMaxLine(cm) {
                var d = cm.display, doc = cm.doc;
                d.maxLine = getLine(doc, doc.first);
                d.maxLineLength = lineLength(d.maxLine);
                d.maxLineChanged = true;
                doc.iter(function (line) {
                    var len = lineLength(line);
                    if (len > d.maxLineLength) {
                        d.maxLineLength = len;
                        d.maxLine = line;
                    }
                });
            }

            // BIDI HELPERS

            function iterateBidiSections(order, from, to, f) {
                if (!order) {
                    return f(from, to, "ltr", 0)
                }
                var found = false;
                for (var i = 0; i < order.length; ++i) {
                    var part = order[i];
                    if (part.from < to && part.to > from || from == to && part.to == from) {
                        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i);
                        found = true;
                    }
                }
                if (!found) {
                    f(from, to, "ltr");
                }
            }

            var bidiOther = null;

            function getBidiPartAt(order, ch, sticky) {
                var found;
                bidiOther = null;
                for (var i = 0; i < order.length; ++i) {
                    var cur = order[i];
                    if (cur.from < ch && cur.to > ch) {
                        return i
                    }
                    if (cur.to == ch) {
                        if (cur.from != cur.to && sticky == "before") {
                            found = i;
                        } else {
                            bidiOther = i;
                        }
                    }
                    if (cur.from == ch) {
                        if (cur.from != cur.to && sticky != "before") {
                            found = i;
                        } else {
                            bidiOther = i;
                        }
                    }
                }
                return found != null ? found : bidiOther
            }

            // Bidirectional ordering algorithm
            // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
            // that this (partially) implements.

            // One-char codes used for character types:
            // L (L):   Left-to-Right
            // R (R):   Right-to-Left
            // r (AL):  Right-to-Left Arabic
            // 1 (EN):  European Number
            // + (ES):  European Number Separator
            // % (ET):  European Number Terminator
            // n (AN):  Arabic Number
            // , (CS):  Common Number Separator
            // m (NSM): Non-Spacing Mark
            // b (BN):  Boundary Neutral
            // s (B):   Paragraph Separator
            // t (S):   Segment Separator
            // w (WS):  Whitespace
            // N (ON):  Other Neutrals

            // Returns null if characters are ordered as they appear
            // (left-to-right), or an array of sections ({from, to, level}
            // objects) in the order in which they occur visually.
            var bidiOrdering = (function () {
                // Character types for codepoints 0 to 0xff
                var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
                // Character types for codepoints 0x600 to 0x6f9
                var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";

                function charType(code) {
                    if (code <= 0xf7) {
                        return lowTypes.charAt(code)
                    } else if (0x590 <= code && code <= 0x5f4) {
                        return "R"
                    } else if (0x600 <= code && code <= 0x6f9) {
                        return arabicTypes.charAt(code - 0x600)
                    } else if (0x6ee <= code && code <= 0x8ac) {
                        return "r"
                    } else if (0x2000 <= code && code <= 0x200b) {
                        return "w"
                    } else if (code == 0x200c) {
                        return "b"
                    } else {
                        return "L"
                    }
                }

                var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
                var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;

                function BidiSpan(level, from, to) {
                    this.level = level;
                    this.from = from;
                    this.to = to;
                }

                return function (str, direction) {
                    var outerType = direction == "ltr" ? "L" : "R";

                    if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) {
                        return false
                    }
                    var len = str.length, types = [];
                    for (var i = 0; i < len; ++i) {
                        types.push(charType(str.charCodeAt(i)));
                    }

                    // W1. Examine each non-spacing mark (NSM) in the level run, and
                    // change the type of the NSM to the type of the previous
                    // character. If the NSM is at the start of the level run, it will
                    // get the type of sor.
                    for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
                        var type = types[i$1];
                        if (type == "m") {
                            types[i$1] = prev;
                        } else {
                            prev = type;
                        }
                    }

                    // W2. Search backwards from each instance of a European number
                    // until the first strong type (R, L, AL, or sor) is found. If an
                    // AL is found, change the type of the European number to Arabic
                    // number.
                    // W3. Change all ALs to R.
                    for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
                        var type$1 = types[i$2];
                        if (type$1 == "1" && cur == "r") {
                            types[i$2] = "n";
                        } else if (isStrong.test(type$1)) {
                            cur = type$1;
                            if (type$1 == "r") {
                                types[i$2] = "R";
                            }
                        }
                    }

                    // W4. A single European separator between two European numbers
                    // changes to a European number. A single common separator between
                    // two numbers of the same type changes to that type.
                    for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
                        var type$2 = types[i$3];
                        if (type$2 == "+" && prev$1 == "1" && types[i$3 + 1] == "1") {
                            types[i$3] = "1";
                        } else if (type$2 == "," && prev$1 == types[i$3 + 1] &&
                            (prev$1 == "1" || prev$1 == "n")) {
                            types[i$3] = prev$1;
                        }
                        prev$1 = type$2;
                    }

                    // W5. A sequence of European terminators adjacent to European
                    // numbers changes to all European numbers.
                    // W6. Otherwise, separators and terminators change to Other
                    // Neutral.
                    for (var i$4 = 0; i$4 < len; ++i$4) {
                        var type$3 = types[i$4];
                        if (type$3 == ",") {
                            types[i$4] = "N";
                        } else if (type$3 == "%") {
                            var end = (void 0);
                            for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {
                            }
                            var replace = (i$4 && types[i$4 - 1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
                            for (var j = i$4; j < end; ++j) {
                                types[j] = replace;
                            }
                            i$4 = end - 1;
                        }
                    }

                    // W7. Search backwards from each instance of a European number
                    // until the first strong type (R, L, or sor) is found. If an L is
                    // found, then change the type of the European number to L.
                    for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
                        var type$4 = types[i$5];
                        if (cur$1 == "L" && type$4 == "1") {
                            types[i$5] = "L";
                        } else if (isStrong.test(type$4)) {
                            cur$1 = type$4;
                        }
                    }

                    // N1. A sequence of neutrals takes the direction of the
                    // surrounding strong text if the text on both sides has the same
                    // direction. European and Arabic numbers act as if they were R in
                    // terms of their influence on neutrals. Start-of-level-run (sor)
                    // and end-of-level-run (eor) are used at level run boundaries.
                    // N2. Any remaining neutrals take the embedding direction.
                    for (var i$6 = 0; i$6 < len; ++i$6) {
                        if (isNeutral.test(types[i$6])) {
                            var end$1 = (void 0);
                            for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {
                            }
                            var before = (i$6 ? types[i$6 - 1] : outerType) == "L";
                            var after = (end$1 < len ? types[end$1] : outerType) == "L";
                            var replace$1 = before == after ? (before ? "L" : "R") : outerType;
                            for (var j$1 = i$6; j$1 < end$1; ++j$1) {
                                types[j$1] = replace$1;
                            }
                            i$6 = end$1 - 1;
                        }
                    }

                    // Here we depart from the documented algorithm, in order to avoid
                    // building up an actual levels array. Since there are only three
                    // levels (0, 1, 2) in an implementation that doesn't take
                    // explicit embedding into account, we can build up the order on
                    // the fly, without following the level-based algorithm.
                    var order = [], m;
                    for (var i$7 = 0; i$7 < len;) {
                        if (countsAsLeft.test(types[i$7])) {
                            var start = i$7;
                            for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {
                            }
                            order.push(new BidiSpan(0, start, i$7));
                        } else {
                            var pos = i$7, at = order.length;
                            for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {
                            }
                            for (var j$2 = pos; j$2 < i$7;) {
                                if (countsAsNum.test(types[j$2])) {
                                    if (pos < j$2) {
                                        order.splice(at, 0, new BidiSpan(1, pos, j$2));
                                    }
                                    var nstart = j$2;
                                    for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {
                                    }
                                    order.splice(at, 0, new BidiSpan(2, nstart, j$2));
                                    pos = j$2;
                                } else {
                                    ++j$2;
                                }
                            }
                            if (pos < i$7) {
                                order.splice(at, 0, new BidiSpan(1, pos, i$7));
                            }
                        }
                    }
                    if (direction == "ltr") {
                        if (order[0].level == 1 && (m = str.match(/^\s+/))) {
                            order[0].from = m[0].length;
                            order.unshift(new BidiSpan(0, 0, m[0].length));
                        }
                        if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
                            lst(order).to -= m[0].length;
                            order.push(new BidiSpan(0, len - m[0].length, len));
                        }
                    }

                    return direction == "rtl" ? order.reverse() : order
                }
            })();

            // Get the bidi ordering for the given line (and cache it). Returns
            // false for lines that are fully left-to-right, and an array of
            // BidiSpan objects otherwise.
            function getOrder(line, direction) {
                var order = line.order;
                if (order == null) {
                    order = line.order = bidiOrdering(line.text, direction);
                }
                return order
            }

            // EVENT HANDLING

            // Lightweight event framework. on/off also work on DOM nodes,
            // registering native DOM handlers.

            var noHandlers = [];

            var on = function (emitter, type, f) {
                if (emitter.addEventListener) {
                    emitter.addEventListener(type, f, false);
                } else if (emitter.attachEvent) {
                    emitter.attachEvent("on" + type, f);
                } else {
                    var map$$1 = emitter._handlers || (emitter._handlers = {});
                    map$$1[type] = (map$$1[type] || noHandlers).concat(f);
                }
            };

            function getHandlers(emitter, type) {
                return emitter._handlers && emitter._handlers[type] || noHandlers
            }

            function off(emitter, type, f) {
                if (emitter.removeEventListener) {
                    emitter.removeEventListener(type, f, false);
                } else if (emitter.detachEvent) {
                    emitter.detachEvent("on" + type, f);
                } else {
                    var map$$1 = emitter._handlers, arr = map$$1 && map$$1[type];
                    if (arr) {
                        var index = indexOf(arr, f);
                        if (index > -1) {
                            map$$1[type] = arr.slice(0, index).concat(arr.slice(index + 1));
                        }
                    }
                }
            }

            function signal(emitter, type /*, values...*/) {
                var handlers = getHandlers(emitter, type);
                if (!handlers.length) {
                    return
                }
                var args = Array.prototype.slice.call(arguments, 2);
                for (var i = 0; i < handlers.length; ++i) {
                    handlers[i].apply(null, args);
                }
            }

            // The DOM events that CodeMirror handles can be overridden by
            // registering a (non-DOM) handler on the editor for the event name,
            // and preventDefault-ing the event in that handler.
            function signalDOMEvent(cm, e, override) {
                if (typeof e == "string") {
                    e = {
                        type: e, preventDefault: function () {
                            this.defaultPrevented = true;
                        }
                    };
                }
                signal(cm, override || e.type, cm, e);
                return e_defaultPrevented(e) || e.codemirrorIgnore
            }

            function signalCursorActivity(cm) {
                var arr = cm._handlers && cm._handlers.cursorActivity;
                if (!arr) {
                    return
                }
                var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
                for (var i = 0; i < arr.length; ++i) {
                    if (indexOf(set, arr[i]) == -1) {
                        set.push(arr[i]);
                    }
                }
            }

            function hasHandler(emitter, type) {
                return getHandlers(emitter, type).length > 0
            }

            // Add on and off methods to a constructor's prototype, to make
            // registering events on such objects more convenient.
            function eventMixin(ctor) {
                ctor.prototype.on = function (type, f) {
                    on(this, type, f);
                };
                ctor.prototype.off = function (type, f) {
                    off(this, type, f);
                };
            }

            // Due to the fact that we still support jurassic IE versions, some
            // compatibility wrappers are needed.

            function e_preventDefault(e) {
                if (e.preventDefault) {
                    e.preventDefault();
                } else {
                    e.returnValue = false;
                }
            }

            function e_stopPropagation(e) {
                if (e.stopPropagation) {
                    e.stopPropagation();
                } else {
                    e.cancelBubble = true;
                }
            }

            function e_defaultPrevented(e) {
                return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
            }

            function e_stop(e) {
                e_preventDefault(e);
                e_stopPropagation(e);
            }

            function e_target(e) {
                return e.target || e.srcElement
            }

            function e_button(e) {
                var b = e.which;
                if (b == null) {
                    if (e.button & 1) {
                        b = 1;
                    } else if (e.button & 2) {
                        b = 3;
                    } else if (e.button & 4) {
                        b = 2;
                    }
                }
                if (mac && e.ctrlKey && b == 1) {
                    b = 3;
                }
                return b
            }

            // Detect drag-and-drop
            var dragAndDrop = function () {
                // There is *some* kind of drag-and-drop support in IE6-8, but I
                // couldn't get it to work yet.
                if (ie && ie_version < 9) {
                    return false
                }
                var div = elt('div');
                return "draggable" in div || "dragDrop" in div
            }();

            var zwspSupported;

            function zeroWidthElement(measure) {
                if (zwspSupported == null) {
                    var test = elt("span", "\u200b");
                    removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
                    if (measure.firstChild.offsetHeight != 0) {
                        zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8);
                    }
                }
                var node = zwspSupported ? elt("span", "\u200b") :
                    elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
                node.setAttribute("cm-text", "");
                return node
            }

            // Feature-detect IE's crummy client rect reporting for bidi text
            var badBidiRects;

            function hasBadBidiRects(measure) {
                if (badBidiRects != null) {
                    return badBidiRects
                }
                var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
                var r0 = range(txt, 0, 1).getBoundingClientRect();
                var r1 = range(txt, 1, 2).getBoundingClientRect();
                removeChildren(measure);
                if (!r0 || r0.left == r0.right) {
                    return false
                } // Safari returns null in some cases (#2780)
                return badBidiRects = (r1.right - r0.right < 3)
            }

            // See if "".split is the broken IE version, if so, provide an
            // alternative way to split lines.
            var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
                var pos = 0, result = [], l = string.length;
                while (pos <= l) {
                    var nl = string.indexOf("\n", pos);
                    if (nl == -1) {
                        nl = string.length;
                    }
                    var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
                    var rt = line.indexOf("\r");
                    if (rt != -1) {
                        result.push(line.slice(0, rt));
                        pos += rt + 1;
                    } else {
                        result.push(line);
                        pos = nl + 1;
                    }
                }
                return result
            } : function (string) {
                return string.split(/\r\n?|\n/);
            };

            var hasSelection = window.getSelection ? function (te) {
                try {
                    return te.selectionStart != te.selectionEnd
                } catch (e) {
                    return false
                }
            } : function (te) {
                var range$$1;
                try {
                    range$$1 = te.ownerDocument.selection.createRange();
                } catch (e) {
                }
                if (!range$$1 || range$$1.parentElement() != te) {
                    return false
                }
                return range$$1.compareEndPoints("StartToEnd", range$$1) != 0
            };

            var hasCopyEvent = (function () {
                var e = elt("div");
                if ("oncopy" in e) {
                    return true
                }
                e.setAttribute("oncopy", "return;");
                return typeof e.oncopy == "function"
            })();

            var badZoomedRects = null;

            function hasBadZoomedRects(measure) {
                if (badZoomedRects != null) {
                    return badZoomedRects
                }
                var node = removeChildrenAndAdd(measure, elt("span", "x"));
                var normal = node.getBoundingClientRect();
                var fromRange = range(node, 0, 1).getBoundingClientRect();
                return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
            }

            // Known modes, by name and by MIME
            var modes = {}, mimeModes = {};

            // Extra arguments are stored as the mode's dependencies, which is
            // used by (legacy) mechanisms like loadmode.js to automatically
            // load a mode. (Preferred mechanism is the require/define calls.)
            function defineMode(name, mode) {
                if (arguments.length > 2) {
                    mode.dependencies = Array.prototype.slice.call(arguments, 2);
                }
                modes[name] = mode;
            }

            function defineMIME(mime, spec) {
                mimeModes[mime] = spec;
            }

            // Given a MIME type, a {name, ...options} config object, or a name
            // string, return a mode config object.
            function resolveMode(spec) {
                if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
                    spec = mimeModes[spec];
                } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
                    var found = mimeModes[spec.name];
                    if (typeof found == "string") {
                        found = {name: found};
                    }
                    spec = createObj(found, spec);
                    spec.name = found.name;
                } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
                    return resolveMode("application/xml")
                } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
                    return resolveMode("application/json")
                }
                if (typeof spec == "string") {
                    return {name: spec}
                } else {
                    return spec || {name: "null"}
                }
            }

            // Given a mode spec (anything that resolveMode accepts), find and
            // initialize an actual mode object.
            function getMode(options, spec) {
                spec = resolveMode(spec);
                var mfactory = modes[spec.name];
                if (!mfactory) {
                    return getMode(options, "text/plain")
                }
                var modeObj = mfactory(options, spec);
                if (modeExtensions.hasOwnProperty(spec.name)) {
                    var exts = modeExtensions[spec.name];
                    for (var prop in exts) {
                        if (!exts.hasOwnProperty(prop)) {
                            continue
                        }
                        if (modeObj.hasOwnProperty(prop)) {
                            modeObj["_" + prop] = modeObj[prop];
                        }
                        modeObj[prop] = exts[prop];
                    }
                }
                modeObj.name = spec.name;
                if (spec.helperType) {
                    modeObj.helperType = spec.helperType;
                }
                if (spec.modeProps) {
                    for (var prop$1 in spec.modeProps) {
                        modeObj[prop$1] = spec.modeProps[prop$1];
                    }
                }

                return modeObj
            }

            // This can be used to attach properties to mode objects from
            // outside the actual mode definition.
            var modeExtensions = {};

            function extendMode(mode, properties) {
                var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
                copyObj(properties, exts);
            }

            function copyState(mode, state) {
                if (state === true) {
                    return state
                }
                if (mode.copyState) {
                    return mode.copyState(state)
                }
                var nstate = {};
                for (var n in state) {
                    var val = state[n];
                    if (val instanceof Array) {
                        val = val.concat([]);
                    }
                    nstate[n] = val;
                }
                return nstate
            }

            // Given a mode and a state (for that mode), find the inner mode and
            // state at the position that the state refers to.
            function innerMode(mode, state) {
                var info;
                while (mode.innerMode) {
                    info = mode.innerMode(state);
                    if (!info || info.mode == mode) {
                        break
                    }
                    state = info.state;
                    mode = info.mode;
                }
                return info || {mode: mode, state: state}
            }

            function startState(mode, a1, a2) {
                return mode.startState ? mode.startState(a1, a2) : true
            }

            // STRING STREAM

            // Fed to the mode parsers, provides helper functions to make
            // parsers more succinct.

            var StringStream = function (string, tabSize, lineOracle) {
                this.pos = this.start = 0;
                this.string = string;
                this.tabSize = tabSize || 8;
                this.lastColumnPos = this.lastColumnValue = 0;
                this.lineStart = 0;
                this.lineOracle = lineOracle;
            };

            StringStream.prototype.eol = function () {
                return this.pos >= this.string.length
            };
            StringStream.prototype.sol = function () {
                return this.pos == this.lineStart
            };
            StringStream.prototype.peek = function () {
                return this.string.charAt(this.pos) || undefined
            };
            StringStream.prototype.next = function () {
                if (this.pos < this.string.length) {
                    return this.string.charAt(this.pos++)
                }
            };
            StringStream.prototype.eat = function (match) {
                var ch = this.string.charAt(this.pos);
                var ok;
                if (typeof match == "string") {
                    ok = ch == match;
                } else {
                    ok = ch && (match.test ? match.test(ch) : match(ch));
                }
                if (ok) {
                    ++this.pos;
                    return ch
                }
            };
            StringStream.prototype.eatWhile = function (match) {
                var start = this.pos;
                while (this.eat(match)) {
                }
                return this.pos > start
            };
            StringStream.prototype.eatSpace = function () {
                var this$1 = this;

                var start = this.pos;
                while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) {
                    ++this$1.pos;
                }
                return this.pos > start
            };
            StringStream.prototype.skipToEnd = function () {
                this.pos = this.string.length;
            };
            StringStream.prototype.skipTo = function (ch) {
                var found = this.string.indexOf(ch, this.pos);
                if (found > -1) {
                    this.pos = found;
                    return true
                }
            };
            StringStream.prototype.backUp = function (n) {
                this.pos -= n;
            };
            StringStream.prototype.column = function () {
                if (this.lastColumnPos < this.start) {
                    this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
                    this.lastColumnPos = this.start;
                }
                return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
            };
            StringStream.prototype.indentation = function () {
                return countColumn(this.string, null, this.tabSize) -
                    (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
            };
            StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
                if (typeof pattern == "string") {
                    var cased = function (str) {
                        return caseInsensitive ? str.toLowerCase() : str;
                    };
                    var substr = this.string.substr(this.pos, pattern.length);
                    if (cased(substr) == cased(pattern)) {
                        if (consume !== false) {
                            this.pos += pattern.length;
                        }
                        return true
                    }
                } else {
                    var match = this.string.slice(this.pos).match(pattern);
                    if (match && match.index > 0) {
                        return null
                    }
                    if (match && consume !== false) {
                        this.pos += match[0].length;
                    }
                    return match
                }
            };
            StringStream.prototype.current = function () {
                return this.string.slice(this.start, this.pos)
            };
            StringStream.prototype.hideFirstChars = function (n, inner) {
                this.lineStart += n;
                try {
                    return inner()
                } finally {
                    this.lineStart -= n;
                }
            };
            StringStream.prototype.lookAhead = function (n) {
                var oracle = this.lineOracle;
                return oracle && oracle.lookAhead(n)
            };
            StringStream.prototype.baseToken = function () {
                var oracle = this.lineOracle;
                return oracle && oracle.baseToken(this.pos)
            };

            var SavedContext = function (state, lookAhead) {
                this.state = state;
                this.lookAhead = lookAhead;
            };

            var Context = function (doc, state, line, lookAhead) {
                this.state = state;
                this.doc = doc;
                this.line = line;
                this.maxLookAhead = lookAhead || 0;
                this.baseTokens = null;
                this.baseTokenPos = 1;
            };

            Context.prototype.lookAhead = function (n) {
                var line = this.doc.getLine(this.line + n);
                if (line != null && n > this.maxLookAhead) {
                    this.maxLookAhead = n;
                }
                return line
            };

            Context.prototype.baseToken = function (n) {
                var this$1 = this;

                if (!this.baseTokens) {
                    return null
                }
                while (this.baseTokens[this.baseTokenPos] <= n) {
                    this$1.baseTokenPos += 2;
                }
                var type = this.baseTokens[this.baseTokenPos + 1];
                return {
                    type: type && type.replace(/( |^)overlay .*/, ""),
                    size: this.baseTokens[this.baseTokenPos] - n
                }
            };

            Context.prototype.nextLine = function () {
                this.line++;
                if (this.maxLookAhead > 0) {
                    this.maxLookAhead--;
                }
            };

            Context.fromSaved = function (doc, saved, line) {
                if (saved instanceof SavedContext) {
                    return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead)
                } else {
                    return new Context(doc, copyState(doc.mode, saved), line)
                }
            };

            Context.prototype.save = function (copy) {
                var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
                return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
            };


            // Compute a style array (an array starting with a mode generation
            // -- for invalidation -- followed by pairs of end positions and
            // style strings), which is used to highlight the tokens on the
            // line.
            function highlightLine(cm, line, context, forceToEnd) {
                // A styles array always starts with a number identifying the
                // mode/overlays that it is based on (for easy invalidation).
                var st = [cm.state.modeGen], lineClasses = {};
                // Compute the base array of styles
                runMode(cm, line.text, cm.doc.mode, context, function (end, style) {
                        return st.push(end, style);
                    },
                    lineClasses, forceToEnd);
                var state = context.state;

                // Run overlays, adjust style array.
                var loop = function (o) {
                    context.baseTokens = st;
                    var overlay = cm.state.overlays[o], i = 1, at = 0;
                    context.state = true;
                    runMode(cm, line.text, overlay.mode, context, function (end, style) {
                        var start = i;
                        // Ensure there's a token end at the current position, and that i points at it
                        while (at < end) {
                            var i_end = st[i];
                            if (i_end > end) {
                                st.splice(i, 1, end, st[i + 1], i_end);
                            }
                            i += 2;
                            at = Math.min(end, i_end);
                        }
                        if (!style) {
                            return
                        }
                        if (overlay.opaque) {
                            st.splice(start, i - start, end, "overlay " + style);
                            i = start + 2;
                        } else {
                            for (; start < i; start += 2) {
                                var cur = st[start + 1];
                                st[start + 1] = (cur ? cur + " " : "") + "overlay " + style;
                            }
                        }
                    }, lineClasses);
                    context.state = state;
                    context.baseTokens = null;
                    context.baseTokenPos = 1;
                };

                for (var o = 0; o < cm.state.overlays.length; ++o) loop(o);

                return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
            }

            function getLineStyles(cm, line, updateFrontier) {
                if (!line.styles || line.styles[0] != cm.state.modeGen) {
                    var context = getContextBefore(cm, lineNo(line));
                    var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
                    var result = highlightLine(cm, line, context);
                    if (resetState) {
                        context.state = resetState;
                    }
                    line.stateAfter = context.save(!resetState);
                    line.styles = result.styles;
                    if (result.classes) {
                        line.styleClasses = result.classes;
                    } else if (line.styleClasses) {
                        line.styleClasses = null;
                    }
                    if (updateFrontier === cm.doc.highlightFrontier) {
                        cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier);
                    }
                }
                return line.styles
            }

            function getContextBefore(cm, n, precise) {
                var doc = cm.doc, display = cm.display;
                if (!doc.mode.startState) {
                    return new Context(doc, true, n)
                }
                var start = findStartLine(cm, n, precise);
                var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
                var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);

                doc.iter(start, n, function (line) {
                    processLine(cm, line.text, context);
                    var pos = context.line;
                    line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
                    context.nextLine();
                });
                if (precise) {
                    doc.modeFrontier = context.line;
                }
                return context
            }

            // Lightweight form of highlight -- proceed over this line and
            // update state, but don't save a style array. Used for lines that
            // aren't currently visible.
            function processLine(cm, text, context, startAt) {
                var mode = cm.doc.mode;
                var stream = new StringStream(text, cm.options.tabSize, context);
                stream.start = stream.pos = startAt || 0;
                if (text == "") {
                    callBlankLine(mode, context.state);
                }
                while (!stream.eol()) {
                    readToken(mode, stream, context.state);
                    stream.start = stream.pos;
                }
            }

            function callBlankLine(mode, state) {
                if (mode.blankLine) {
                    return mode.blankLine(state)
                }
                if (!mode.innerMode) {
                    return
                }
                var inner = innerMode(mode, state);
                if (inner.mode.blankLine) {
                    return inner.mode.blankLine(inner.state)
                }
            }

            function readToken(mode, stream, state, inner) {
                for (var i = 0; i < 10; i++) {
                    if (inner) {
                        inner[0] = innerMode(mode, state).mode;
                    }
                    var style = mode.token(stream, state);
                    if (stream.pos > stream.start) {
                        return style
                    }
                }
                throw new Error("Mode " + mode.name + " failed to advance stream.")
            }

            var Token = function (stream, type, state) {
                this.start = stream.start;
                this.end = stream.pos;
                this.string = stream.current();
                this.type = type || null;
                this.state = state;
            };

            // Utility for getTokenAt and getLineTokens
            function takeToken(cm, pos, precise, asArray) {
                var doc = cm.doc, mode = doc.mode, style;
                pos = clipPos(doc, pos);
                var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);
                var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;
                if (asArray) {
                    tokens = [];
                }
                while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
                    stream.start = stream.pos;
                    style = readToken(mode, stream, context.state);
                    if (asArray) {
                        tokens.push(new Token(stream, style, copyState(doc.mode, context.state)));
                    }
                }
                return asArray ? tokens : new Token(stream, style, context.state)
            }

            function extractLineClasses(type, output) {
                if (type) {
                    for (; ;) {
                        var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
                        if (!lineClass) {
                            break
                        }
                        type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
                        var prop = lineClass[1] ? "bgClass" : "textClass";
                        if (output[prop] == null) {
                            output[prop] = lineClass[2];
                        } else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop])) {
                            output[prop] += " " + lineClass[2];
                        }
                    }
                }
                return type
            }

            // Run the given mode's parser over a line, calling f for each token.
            function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
                var flattenSpans = mode.flattenSpans;
                if (flattenSpans == null) {
                    flattenSpans = cm.options.flattenSpans;
                }
                var curStart = 0, curStyle = null;
                var stream = new StringStream(text, cm.options.tabSize, context), style;
                var inner = cm.options.addModeClass && [null];
                if (text == "") {
                    extractLineClasses(callBlankLine(mode, context.state), lineClasses);
                }
                while (!stream.eol()) {
                    if (stream.pos > cm.options.maxHighlightLength) {
                        flattenSpans = false;
                        if (forceToEnd) {
                            processLine(cm, text, context, stream.pos);
                        }
                        stream.pos = text.length;
                        style = null;
                    } else {
                        style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
                    }
                    if (inner) {
                        var mName = inner[0].name;
                        if (mName) {
                            style = "m-" + (style ? mName + " " + style : mName);
                        }
                    }
                    if (!flattenSpans || curStyle != style) {
                        while (curStart < stream.start) {
                            curStart = Math.min(stream.start, curStart + 5000);
                            f(curStart, curStyle);
                        }
                        curStyle = style;
                    }
                    stream.start = stream.pos;
                }
                while (curStart < stream.pos) {
                    // Webkit seems to refuse to render text nodes longer than 57444
                    // characters, and returns inaccurate measurements in nodes
                    // starting around 5000 chars.
                    var pos = Math.min(stream.pos, curStart + 5000);
                    f(pos, curStyle);
                    curStart = pos;
                }
            }

            // Finds the line to start with when starting a parse. Tries to
            // find a line with a stateAfter, so that it can start with a
            // valid state. If that fails, it returns the line with the
            // smallest indentation, which tends to need the least context to
            // parse correctly.
            function findStartLine(cm, n, precise) {
                var minindent, minline, doc = cm.doc;
                var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
                for (var search = n; search > lim; --search) {
                    if (search <= doc.first) {
                        return doc.first
                    }
                    var line = getLine(doc, search - 1), after = line.stateAfter;
                    if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier)) {
                        return search
                    }
                    var indented = countColumn(line.text, null, cm.options.tabSize);
                    if (minline == null || minindent > indented) {
                        minline = search - 1;
                        minindent = indented;
                    }
                }
                return minline
            }

            function retreatFrontier(doc, n) {
                doc.modeFrontier = Math.min(doc.modeFrontier, n);
                if (doc.highlightFrontier < n - 10) {
                    return
                }
                var start = doc.first;
                for (var line = n - 1; line > start; line--) {
                    var saved = getLine(doc, line).stateAfter;
                    // change is on 3
                    // state on line 1 looked ahead 2 -- so saw 3
                    // test 1 + 2 < 3 should cover this
                    if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
                        start = line + 1;
                        break
                    }
                }
                doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
            }

            // LINE DATA STRUCTURE

            // Line objects. These hold state related to a line, including
            // highlighting info (the styles array).
            var Line = function (text, markedSpans, estimateHeight) {
                this.text = text;
                attachMarkedSpans(this, markedSpans);
                this.height = estimateHeight ? estimateHeight(this) : 1;
            };

            Line.prototype.lineNo = function () {
                return lineNo(this)
            };
            eventMixin(Line);

            // Change the content (text, markers) of a line. Automatically
            // invalidates cached information and tries to re-estimate the
            // line's height.
            function updateLine(line, text, markedSpans, estimateHeight) {
                line.text = text;
                if (line.stateAfter) {
                    line.stateAfter = null;
                }
                if (line.styles) {
                    line.styles = null;
                }
                if (line.order != null) {
                    line.order = null;
                }
                detachMarkedSpans(line);
                attachMarkedSpans(line, markedSpans);
                var estHeight = estimateHeight ? estimateHeight(line) : 1;
                if (estHeight != line.height) {
                    updateLineHeight(line, estHeight);
                }
            }

            // Detach a line from the document tree and its markers.
            function cleanUpLine(line) {
                line.parent = null;
                detachMarkedSpans(line);
            }

            // Convert a style as returned by a mode (either null, or a string
            // containing one or more styles) to a CSS style. This is cached,
            // and also looks for line-wide styles.
            var styleToClassCache = {}, styleToClassCacheWithMode = {};

            function interpretTokenStyle(style, options) {
                if (!style || /^\s*$/.test(style)) {
                    return null
                }
                var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
                return cache[style] ||
                    (cache[style] = style.replace(/\S+/g, "cm-$&"))
            }

            // Render the DOM representation of the text of a line. Also builds
            // up a 'line map', which points at the DOM nodes that represent
            // specific stretches of text, and is used by the measuring code.
            // The returned object contains the DOM node, this map, and
            // information about line-wide styles that were set by the mode.
            function buildLineContent(cm, lineView) {
                // The padding-right forces the element to have a 'border', which
                // is needed on Webkit to be able to get line-level bounding
                // rectangles for it (in measureChar).
                var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
                var builder = {
                    pre: eltP("pre", [content], "CodeMirror-line"), content: content,
                    col: 0, pos: 0, cm: cm,
                    trailingSpace: false,
                    splitSpaces: cm.getOption("lineWrapping")
                };
                lineView.measure = {};

                // Iterate over the logical lines that make up this visual line.
                for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
                    var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);
                    builder.pos = 0;
                    builder.addToken = buildToken;
                    // Optionally wire in some hacks into the token-rendering
                    // algorithm, to deal with browser quirks.
                    if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction))) {
                        builder.addToken = buildTokenBadBidi(builder.addToken, order);
                    }
                    builder.map = [];
                    var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
                    insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
                    if (line.styleClasses) {
                        if (line.styleClasses.bgClass) {
                            builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || "");
                        }
                        if (line.styleClasses.textClass) {
                            builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || "");
                        }
                    }

                    // Ensure at least a single node is present, for measuring.
                    if (builder.map.length == 0) {
                        builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure)));
                    }

                    // Store the map and a cache object for the current logical line
                    if (i == 0) {
                        lineView.measure.map = builder.map;
                        lineView.measure.cache = {};
                    } else {
                        (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
                        ;(lineView.measure.caches || (lineView.measure.caches = [])).push({});
                    }
                }

                // See issue #2901
                if (webkit) {
                    var last = builder.content.lastChild;
                    if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab"))) {
                        builder.content.className = "cm-tab-wrap-hack";
                    }
                }

                signal(cm, "renderLine", cm, lineView.line, builder.pre);
                if (builder.pre.className) {
                    builder.textClass = joinClasses(builder.pre.className, builder.textClass || "");
                }

                return builder
            }

            function defaultSpecialCharPlaceholder(ch) {
                var token = elt("span", "\u2022", "cm-invalidchar");
                token.title = "\\u" + ch.charCodeAt(0).toString(16);
                token.setAttribute("aria-label", token.title);
                return token
            }

            // Build up the DOM representation for a single token, and add it to
            // the line map. Takes care to render special characters separately.
            function buildToken(builder, text, style, startStyle, endStyle, title, css) {
                if (!text) {
                    return
                }
                var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
                var special = builder.cm.state.specialChars, mustWrap = false;
                var content;
                if (!special.test(text)) {
                    builder.col += text.length;
                    content = document.createTextNode(displayText);
                    builder.map.push(builder.pos, builder.pos + text.length, content);
                    if (ie && ie_version < 9) {
                        mustWrap = true;
                    }
                    builder.pos += text.length;
                } else {
                    content = document.createDocumentFragment();
                    var pos = 0;
                    while (true) {
                        special.lastIndex = pos;
                        var m = special.exec(text);
                        var skipped = m ? m.index - pos : text.length - pos;
                        if (skipped) {
                            var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
                            if (ie && ie_version < 9) {
                                content.appendChild(elt("span", [txt]));
                            } else {
                                content.appendChild(txt);
                            }
                            builder.map.push(builder.pos, builder.pos + skipped, txt);
                            builder.col += skipped;
                            builder.pos += skipped;
                        }
                        if (!m) {
                            break
                        }
                        pos += skipped + 1;
                        var txt$1 = (void 0);
                        if (m[0] == "\t") {
                            var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
                            txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
                            txt$1.setAttribute("role", "presentation");
                            txt$1.setAttribute("cm-text", "\t");
                            builder.col += tabWidth;
                        } else if (m[0] == "\r" || m[0] == "\n") {
                            txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
                            txt$1.setAttribute("cm-text", m[0]);
                            builder.col += 1;
                        } else {
                            txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
                            txt$1.setAttribute("cm-text", m[0]);
                            if (ie && ie_version < 9) {
                                content.appendChild(elt("span", [txt$1]));
                            } else {
                                content.appendChild(txt$1);
                            }
                            builder.col += 1;
                        }
                        builder.map.push(builder.pos, builder.pos + 1, txt$1);
                        builder.pos++;
                    }
                }
                builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
                if (style || startStyle || endStyle || mustWrap || css) {
                    var fullStyle = style || "";
                    if (startStyle) {
                        fullStyle += startStyle;
                    }
                    if (endStyle) {
                        fullStyle += endStyle;
                    }
                    var token = elt("span", [content], fullStyle, css);
                    if (title) {
                        token.title = title;
                    }
                    return builder.content.appendChild(token)
                }
                builder.content.appendChild(content);
            }

            // Change some spaces to NBSP to prevent the browser from collapsing
            // trailing spaces at the end of a line when rendering text (issue #1362).
            function splitSpaces(text, trailingBefore) {
                if (text.length > 1 && !/  /.test(text)) {
                    return text
                }
                var spaceBefore = trailingBefore, result = "";
                for (var i = 0; i < text.length; i++) {
                    var ch = text.charAt(i);
                    if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32)) {
                        ch = "\u00a0";
                    }
                    result += ch;
                    spaceBefore = ch == " ";
                }
                return result
            }

            // Work around nonsense dimensions being reported for stretches of
            // right-to-left text.
            function buildTokenBadBidi(inner, order) {
                return function (builder, text, style, startStyle, endStyle, title, css) {
                    style = style ? style + " cm-force-border" : "cm-force-border";
                    var start = builder.pos, end = start + text.length;
                    for (; ;) {
                        // Find the part that overlaps with the start of this text
                        var part = (void 0);
                        for (var i = 0; i < order.length; i++) {
                            part = order[i];
                            if (part.to > start && part.from <= start) {
                                break
                            }
                        }
                        if (part.to >= end) {
                            return inner(builder, text, style, startStyle, endStyle, title, css)
                        }
                        inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
                        startStyle = null;
                        text = text.slice(part.to - start);
                        start = part.to;
                    }
                }
            }

            function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
                var widget = !ignoreWidget && marker.widgetNode;
                if (widget) {
                    builder.map.push(builder.pos, builder.pos + size, widget);
                }
                if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
                    if (!widget) {
                        widget = builder.content.appendChild(document.createElement("span"));
                    }
                    widget.setAttribute("cm-marker", marker.id);
                }
                if (widget) {
                    builder.cm.display.input.setUneditable(widget);
                    builder.content.appendChild(widget);
                }
                builder.pos += size;
                builder.trailingSpace = false;
            }

            // Outputs a number of spans to make up a line, taking highlighting
            // and marked text into account.
            function insertLineContent(line, builder, styles) {
                var spans = line.markedSpans, allText = line.text, at = 0;
                if (!spans) {
                    for (var i$1 = 1; i$1 < styles.length; i$1 += 2) {
                        builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1 + 1], builder.cm.options));
                    }
                    return
                }

                var len = allText.length, pos = 0, i = 1, text = "", style, css;
                var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
                for (; ;) {
                    if (nextChange == pos) { // Update current marker set
                        spanStyle = spanEndStyle = spanStartStyle = title = css = "";
                        collapsed = null;
                        nextChange = Infinity;
                        var foundBookmarks = [], endStyles = (void 0);
                        for (var j = 0; j < spans.length; ++j) {
                            var sp = spans[j], m = sp.marker;
                            if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
                                foundBookmarks.push(m);
                            } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
                                if (sp.to != null && sp.to != pos && nextChange > sp.to) {
                                    nextChange = sp.to;
                                    spanEndStyle = "";
                                }
                                if (m.className) {
                                    spanStyle += " " + m.className;
                                }
                                if (m.css) {
                                    css = (css ? css + ";" : "") + m.css;
                                }
                                if (m.startStyle && sp.from == pos) {
                                    spanStartStyle += " " + m.startStyle;
                                }
                                if (m.endStyle && sp.to == nextChange) {
                                    (endStyles || (endStyles = [])).push(m.endStyle, sp.to);
                                }
                                if (m.title && !title) {
                                    title = m.title;
                                }
                                if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0)) {
                                    collapsed = sp;
                                }
                            } else if (sp.from > pos && nextChange > sp.from) {
                                nextChange = sp.from;
                            }
                        }
                        if (endStyles) {
                            for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2) {
                                if (endStyles[j$1 + 1] == nextChange) {
                                    spanEndStyle += " " + endStyles[j$1];
                                }
                            }
                        }

                        if (!collapsed || collapsed.from == pos) {
                            for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2) {
                                buildCollapsedSpan(builder, 0, foundBookmarks[j$2]);
                            }
                        }
                        if (collapsed && (collapsed.from || 0) == pos) {
                            buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
                                collapsed.marker, collapsed.from == null);
                            if (collapsed.to == null) {
                                return
                            }
                            if (collapsed.to == pos) {
                                collapsed = false;
                            }
                        }
                    }
                    if (pos >= len) {
                        break
                    }

                    var upto = Math.min(len, nextChange);
                    while (true) {
                        if (text) {
                            var end = pos + text.length;
                            if (!collapsed) {
                                var tokenText = end > upto ? text.slice(0, upto - pos) : text;
                                builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
                                    spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css);
                            }
                            if (end >= upto) {
                                text = text.slice(upto - pos);
                                pos = upto;
                                break
                            }
                            pos = end;
                            spanStartStyle = "";
                        }
                        text = allText.slice(at, at = styles[i++]);
                        style = interpretTokenStyle(styles[i++], builder.cm.options);
                    }
                }
            }


            // These objects are used to represent the visible (currently drawn)
            // part of the document. A LineView may correspond to multiple
            // logical lines, if those are connected by collapsed ranges.
            function LineView(doc, line, lineN) {
                // The starting line
                this.line = line;
                // Continuing lines, if any
                this.rest = visualLineContinued(line);
                // Number of logical lines in this visual line
                this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
                this.node = this.text = null;
                this.hidden = lineIsHidden(doc, line);
            }

            // Create a range of LineView objects for the given lines.
            function buildViewArray(cm, from, to) {
                var array = [], nextPos;
                for (var pos = from; pos < to; pos = nextPos) {
                    var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
                    nextPos = pos + view.size;
                    array.push(view);
                }
                return array
            }

            var operationGroup = null;

            function pushOperation(op) {
                if (operationGroup) {
                    operationGroup.ops.push(op);
                } else {
                    op.ownsGroup = operationGroup = {
                        ops: [op],
                        delayedCallbacks: []
                    };
                }
            }

            function fireCallbacksForOps(group) {
                // Calls delayed callbacks and cursorActivity handlers until no
                // new ones appear
                var callbacks = group.delayedCallbacks, i = 0;
                do {
                    for (; i < callbacks.length; i++) {
                        callbacks[i].call(null);
                    }
                    for (var j = 0; j < group.ops.length; j++) {
                        var op = group.ops[j];
                        if (op.cursorActivityHandlers) {
                            while (op.cursorActivityCalled < op.cursorActivityHandlers.length) {
                                op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm);
                            }
                        }
                    }
                } while (i < callbacks.length)
            }

            function finishOperation(op, endCb) {
                var group = op.ownsGroup;
                if (!group) {
                    return
                }

                try {
                    fireCallbacksForOps(group);
                } finally {
                    operationGroup = null;
                    endCb(group);
                }
            }

            var orphanDelayedCallbacks = null;

            // Often, we want to signal events at a point where we are in the
            // middle of some work, but don't want the handler to start calling
            // other methods on the editor, which might be in an inconsistent
            // state or simply not expect any other events to happen.
            // signalLater looks whether there are any handlers, and schedules
            // them to be executed when the last operation ends, or, if no
            // operation is active, when a timeout fires.
            function signalLater(emitter, type /*, values...*/) {
                var arr = getHandlers(emitter, type);
                if (!arr.length) {
                    return
                }
                var args = Array.prototype.slice.call(arguments, 2), list;
                if (operationGroup) {
                    list = operationGroup.delayedCallbacks;
                } else if (orphanDelayedCallbacks) {
                    list = orphanDelayedCallbacks;
                } else {
                    list = orphanDelayedCallbacks = [];
                    setTimeout(fireOrphanDelayed, 0);
                }
                var loop = function (i) {
                    list.push(function () {
                        return arr[i].apply(null, args);
                    });
                };

                for (var i = 0; i < arr.length; ++i)
                    loop(i);
            }

            function fireOrphanDelayed() {
                var delayed = orphanDelayedCallbacks;
                orphanDelayedCallbacks = null;
                for (var i = 0; i < delayed.length; ++i) {
                    delayed[i]();
                }
            }

            // When an aspect of a line changes, a string is added to
            // lineView.changes. This updates the relevant part of the line's
            // DOM structure.
            function updateLineForChanges(cm, lineView, lineN, dims) {
                for (var j = 0; j < lineView.changes.length; j++) {
                    var type = lineView.changes[j];
                    if (type == "text") {
                        updateLineText(cm, lineView);
                    } else if (type == "gutter") {
                        updateLineGutter(cm, lineView, lineN, dims);
                    } else if (type == "class") {
                        updateLineClasses(cm, lineView);
                    } else if (type == "widget") {
                        updateLineWidgets(cm, lineView, dims);
                    }
                }
                lineView.changes = null;
            }

            // Lines with gutter elements, widgets or a background class need to
            // be wrapped, and have the extra elements added to the wrapper div
            function ensureLineWrapped(lineView) {
                if (lineView.node == lineView.text) {
                    lineView.node = elt("div", null, null, "position: relative");
                    if (lineView.text.parentNode) {
                        lineView.text.parentNode.replaceChild(lineView.node, lineView.text);
                    }
                    lineView.node.appendChild(lineView.text);
                    if (ie && ie_version < 8) {
                        lineView.node.style.zIndex = 2;
                    }
                }
                return lineView.node
            }

            function updateLineBackground(cm, lineView) {
                var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
                if (cls) {
                    cls += " CodeMirror-linebackground";
                }
                if (lineView.background) {
                    if (cls) {
                        lineView.background.className = cls;
                    } else {
                        lineView.background.parentNode.removeChild(lineView.background);
                        lineView.background = null;
                    }
                } else if (cls) {
                    var wrap = ensureLineWrapped(lineView);
                    lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
                    cm.display.input.setUneditable(lineView.background);
                }
            }

            // Wrapper around buildLineContent which will reuse the structure
            // in display.externalMeasured when possible.
            function getLineContent(cm, lineView) {
                var ext = cm.display.externalMeasured;
                if (ext && ext.line == lineView.line) {
                    cm.display.externalMeasured = null;
                    lineView.measure = ext.measure;
                    return ext.built
                }
                return buildLineContent(cm, lineView)
            }

            // Redraw the line's text. Interacts with the background and text
            // classes because the mode may output tokens that influence these
            // classes.
            function updateLineText(cm, lineView) {
                var cls = lineView.text.className;
                var built = getLineContent(cm, lineView);
                if (lineView.text == lineView.node) {
                    lineView.node = built.pre;
                }
                lineView.text.parentNode.replaceChild(built.pre, lineView.text);
                lineView.text = built.pre;
                if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
                    lineView.bgClass = built.bgClass;
                    lineView.textClass = built.textClass;
                    updateLineClasses(cm, lineView);
                } else if (cls) {
                    lineView.text.className = cls;
                }
            }

            function updateLineClasses(cm, lineView) {
                updateLineBackground(cm, lineView);
                if (lineView.line.wrapClass) {
                    ensureLineWrapped(lineView).className = lineView.line.wrapClass;
                } else if (lineView.node != lineView.text) {
                    lineView.node.className = "";
                }
                var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
                lineView.text.className = textClass || "";
            }

            function updateLineGutter(cm, lineView, lineN, dims) {
                if (lineView.gutter) {
                    lineView.node.removeChild(lineView.gutter);
                    lineView.gutter = null;
                }
                if (lineView.gutterBackground) {
                    lineView.node.removeChild(lineView.gutterBackground);
                    lineView.gutterBackground = null;
                }
                if (lineView.line.gutterClass) {
                    var wrap = ensureLineWrapped(lineView);
                    lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
                        ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
                    cm.display.input.setUneditable(lineView.gutterBackground);
                    wrap.insertBefore(lineView.gutterBackground, lineView.text);
                }
                var markers = lineView.line.gutterMarkers;
                if (cm.options.lineNumbers || markers) {
                    var wrap$1 = ensureLineWrapped(lineView);
                    var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
                    cm.display.input.setUneditable(gutterWrap);
                    wrap$1.insertBefore(gutterWrap, lineView.text);
                    if (lineView.line.gutterClass) {
                        gutterWrap.className += " " + lineView.line.gutterClass;
                    }
                    if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"])) {
                        lineView.lineNumber = gutterWrap.appendChild(
                            elt("div", lineNumberFor(cm.options, lineN),
                                "CodeMirror-linenumber CodeMirror-gutter-elt",
                                ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px")));
                    }
                    if (markers) {
                        for (var k = 0; k < cm.options.gutters.length; ++k) {
                            var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
                            if (found) {
                                gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
                                    ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px")));
                            }
                        }
                    }
                }
            }

            function updateLineWidgets(cm, lineView, dims) {
                if (lineView.alignable) {
                    lineView.alignable = null;
                }
                for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
                    next = node.nextSibling;
                    if (node.className == "CodeMirror-linewidget") {
                        lineView.node.removeChild(node);
                    }
                }
                insertLineWidgets(cm, lineView, dims);
            }

            // Build a line's DOM representation from scratch
            function buildLineElement(cm, lineView, lineN, dims) {
                var built = getLineContent(cm, lineView);
                lineView.text = lineView.node = built.pre;
                if (built.bgClass) {
                    lineView.bgClass = built.bgClass;
                }
                if (built.textClass) {
                    lineView.textClass = built.textClass;
                }

                updateLineClasses(cm, lineView);
                updateLineGutter(cm, lineView, lineN, dims);
                insertLineWidgets(cm, lineView, dims);
                return lineView.node
            }

            // A lineView may contain multiple logical lines (when merged by
            // collapsed spans). The widgets for all of them need to be drawn.
            function insertLineWidgets(cm, lineView, dims) {
                insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
                if (lineView.rest) {
                    for (var i = 0; i < lineView.rest.length; i++) {
                        insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false);
                    }
                }
            }

            function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
                if (!line.widgets) {
                    return
                }
                var wrap = ensureLineWrapped(lineView);
                for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
                    var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
                    if (!widget.handleMouseEvents) {
                        node.setAttribute("cm-ignore-events", "true");
                    }
                    positionLineWidget(widget, node, lineView, dims);
                    cm.display.input.setUneditable(node);
                    if (allowAbove && widget.above) {
                        wrap.insertBefore(node, lineView.gutter || lineView.text);
                    } else {
                        wrap.appendChild(node);
                    }
                    signalLater(widget, "redraw");
                }
            }

            function positionLineWidget(widget, node, lineView, dims) {
                if (widget.noHScroll) {
                    (lineView.alignable || (lineView.alignable = [])).push(node);
                    var width = dims.wrapperWidth;
                    node.style.left = dims.fixedPos + "px";
                    if (!widget.coverGutter) {
                        width -= dims.gutterTotalWidth;
                        node.style.paddingLeft = dims.gutterTotalWidth + "px";
                    }
                    node.style.width = width + "px";
                }
                if (widget.coverGutter) {
                    node.style.zIndex = 5;
                    node.style.position = "relative";
                    if (!widget.noHScroll) {
                        node.style.marginLeft = -dims.gutterTotalWidth + "px";
                    }
                }
            }

            function widgetHeight(widget) {
                if (widget.height != null) {
                    return widget.height
                }
                var cm = widget.doc.cm;
                if (!cm) {
                    return 0
                }
                if (!contains(document.body, widget.node)) {
                    var parentStyle = "position: relative;";
                    if (widget.coverGutter) {
                        parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;";
                    }
                    if (widget.noHScroll) {
                        parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;";
                    }
                    removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
                }
                return widget.height = widget.node.parentNode.offsetHeight
            }

            // Return true when the given mouse event happened in a widget
            function eventInWidget(display, e) {
                for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
                    if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
                        (n.parentNode == display.sizer && n != display.mover)) {
                        return true
                    }
                }
            }

            // POSITION MEASUREMENT

            function paddingTop(display) {
                return display.lineSpace.offsetTop
            }

            function paddingVert(display) {
                return display.mover.offsetHeight - display.lineSpace.offsetHeight
            }

            function paddingH(display) {
                if (display.cachedPaddingH) {
                    return display.cachedPaddingH
                }
                var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
                var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
                var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
                if (!isNaN(data.left) && !isNaN(data.right)) {
                    display.cachedPaddingH = data;
                }
                return data
            }

            function scrollGap(cm) {
                return scrollerGap - cm.display.nativeBarWidth
            }

            function displayWidth(cm) {
                return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
            }

            function displayHeight(cm) {
                return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
            }

            // Ensure the lineView.wrapping.heights array is populated. This is
            // an array of bottom offsets for the lines that make up a drawn
            // line. When lineWrapping is on, there might be more than one
            // height.
            function ensureLineHeights(cm, lineView, rect) {
                var wrapping = cm.options.lineWrapping;
                var curWidth = wrapping && displayWidth(cm);
                if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
                    var heights = lineView.measure.heights = [];
                    if (wrapping) {
                        lineView.measure.width = curWidth;
                        var rects = lineView.text.firstChild.getClientRects();
                        for (var i = 0; i < rects.length - 1; i++) {
                            var cur = rects[i], next = rects[i + 1];
                            if (Math.abs(cur.bottom - next.bottom) > 2) {
                                heights.push((cur.bottom + next.top) / 2 - rect.top);
                            }
                        }
                    }
                    heights.push(rect.bottom - rect.top);
                }
            }

            // Find a line map (mapping character offsets to text nodes) and a
            // measurement cache for the given line number. (A line view might
            // contain multiple lines when collapsed ranges are present.)
            function mapFromLineView(lineView, line, lineN) {
                if (lineView.line == line) {
                    return {map: lineView.measure.map, cache: lineView.measure.cache}
                }
                for (var i = 0; i < lineView.rest.length; i++) {
                    if (lineView.rest[i] == line) {
                        return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]}
                    }
                }
                for (var i$1 = 0; i$1 < lineView.rest.length; i$1++) {
                    if (lineNo(lineView.rest[i$1]) > lineN) {
                        return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true}
                    }
                }
            }

            // Render a line into the hidden node display.externalMeasured. Used
            // when measurement is needed for a line that's not in the viewport.
            function updateExternalMeasurement(cm, line) {
                line = visualLine(line);
                var lineN = lineNo(line);
                var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
                view.lineN = lineN;
                var built = view.built = buildLineContent(cm, view);
                view.text = built.pre;
                removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
                return view
            }

            // Get a {top, bottom, left, right} box (in line-local coordinates)
            // for a given character.
            function measureChar(cm, line, ch, bias) {
                return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
            }

            // Find a line view that corresponds to the given line number.
            function findViewForLine(cm, lineN) {
                if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo) {
                    return cm.display.view[findViewIndex(cm, lineN)]
                }
                var ext = cm.display.externalMeasured;
                if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size) {
                    return ext
                }
            }

            // Measurement can be split in two steps, the set-up work that
            // applies to the whole line, and the measurement of the actual
            // character. Functions like coordsChar, that need to do a lot of
            // measurements in a row, can thus ensure that the set-up work is
            // only done once.
            function prepareMeasureForLine(cm, line) {
                var lineN = lineNo(line);
                var view = findViewForLine(cm, lineN);
                if (view && !view.text) {
                    view = null;
                } else if (view && view.changes) {
                    updateLineForChanges(cm, view, lineN, getDimensions(cm));
                    cm.curOp.forceUpdate = true;
                }
                if (!view) {
                    view = updateExternalMeasurement(cm, line);
                }

                var info = mapFromLineView(view, line, lineN);
                return {
                    line: line, view: view, rect: null,
                    map: info.map, cache: info.cache, before: info.before,
                    hasHeights: false
                }
            }

            // Given a prepared measurement object, measures the position of an
            // actual character (or fetches it from the cache).
            function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
                if (prepared.before) {
                    ch = -1;
                }
                var key = ch + (bias || ""), found;
                if (prepared.cache.hasOwnProperty(key)) {
                    found = prepared.cache[key];
                } else {
                    if (!prepared.rect) {
                        prepared.rect = prepared.view.text.getBoundingClientRect();
                    }
                    if (!prepared.hasHeights) {
                        ensureLineHeights(cm, prepared.view, prepared.rect);
                        prepared.hasHeights = true;
                    }
                    found = measureCharInner(cm, prepared, ch, bias);
                    if (!found.bogus) {
                        prepared.cache[key] = found;
                    }
                }
                return {
                    left: found.left, right: found.right,
                    top: varHeight ? found.rtop : found.top,
                    bottom: varHeight ? found.rbottom : found.bottom
                }
            }

            var nullRect = {left: 0, right: 0, top: 0, bottom: 0};

            function nodeAndOffsetInLineMap(map$$1, ch, bias) {
                var node, start, end, collapse, mStart, mEnd;
                // First, search the line map for the text node corresponding to,
                // or closest to, the target character.
                for (var i = 0; i < map$$1.length; i += 3) {
                    mStart = map$$1[i];
                    mEnd = map$$1[i + 1];
                    if (ch < mStart) {
                        start = 0;
                        end = 1;
                        collapse = "left";
                    } else if (ch < mEnd) {
                        start = ch - mStart;
                        end = start + 1;
                    } else if (i == map$$1.length - 3 || ch == mEnd && map$$1[i + 3] > ch) {
                        end = mEnd - mStart;
                        start = end - 1;
                        if (ch >= mEnd) {
                            collapse = "right";
                        }
                    }
                    if (start != null) {
                        node = map$$1[i + 2];
                        if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right")) {
                            collapse = bias;
                        }
                        if (bias == "left" && start == 0) {
                            while (i && map$$1[i - 2] == map$$1[i - 3] && map$$1[i - 1].insertLeft) {
                                node = map$$1[(i -= 3) + 2];
                                collapse = "left";
                            }
                        }
                        if (bias == "right" && start == mEnd - mStart) {
                            while (i < map$$1.length - 3 && map$$1[i + 3] == map$$1[i + 4] && !map$$1[i + 5].insertLeft) {
                                node = map$$1[(i += 3) + 2];
                                collapse = "right";
                            }
                        }
                        break
                    }
                }
                return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
            }

            function getUsefulRect(rects, bias) {
                var rect = nullRect;
                if (bias == "left") {
                    for (var i = 0; i < rects.length; i++) {
                        if ((rect = rects[i]).left != rect.right) {
                            break
                        }
                    }
                } else {
                    for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
                        if ((rect = rects[i$1]).left != rect.right) {
                            break
                        }
                    }
                }
                return rect
            }

            function measureCharInner(cm, prepared, ch, bias) {
                var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
                var node = place.node, start = place.start, end = place.end, collapse = place.collapse;

                var rect;
                if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
                    for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
                        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) {
                            --start;
                        }
                        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) {
                            ++end;
                        }
                        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart) {
                            rect = node.parentNode.getBoundingClientRect();
                        } else {
                            rect = getUsefulRect(range(node, start, end).getClientRects(), bias);
                        }
                        if (rect.left || rect.right || start == 0) {
                            break
                        }
                        end = start;
                        start = start - 1;
                        collapse = "right";
                    }
                    if (ie && ie_version < 11) {
                        rect = maybeUpdateRectForZooming(cm.display.measure, rect);
                    }
                } else { // If it is a widget, simply get the box for the whole widget.
                    if (start > 0) {
                        collapse = bias = "right";
                    }
                    var rects;
                    if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1) {
                        rect = rects[bias == "right" ? rects.length - 1 : 0];
                    } else {
                        rect = node.getBoundingClientRect();
                    }
                }
                if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
                    var rSpan = node.parentNode.getClientRects()[0];
                    if (rSpan) {
                        rect = {
                            left: rSpan.left,
                            right: rSpan.left + charWidth(cm.display),
                            top: rSpan.top,
                            bottom: rSpan.bottom
                        };
                    } else {
                        rect = nullRect;
                    }
                }

                var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
                var mid = (rtop + rbot) / 2;
                var heights = prepared.view.measure.heights;
                var i = 0;
                for (; i < heights.length - 1; i++) {
                    if (mid < heights[i]) {
                        break
                    }
                }
                var top = i ? heights[i - 1] : 0, bot = heights[i];
                var result = {
                    left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
                    right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
                    top: top, bottom: bot
                };
                if (!rect.left && !rect.right) {
                    result.bogus = true;
                }
                if (!cm.options.singleCursorHeightPerLine) {
                    result.rtop = rtop;
                    result.rbottom = rbot;
                }

                return result
            }

            // Work around problem with bounding client rects on ranges being
            // returned incorrectly when zoomed on IE10 and below.
            function maybeUpdateRectForZooming(measure, rect) {
                if (!window.screen || screen.logicalXDPI == null ||
                    screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure)) {
                    return rect
                }
                var scaleX = screen.logicalXDPI / screen.deviceXDPI;
                var scaleY = screen.logicalYDPI / screen.deviceYDPI;
                return {
                    left: rect.left * scaleX, right: rect.right * scaleX,
                    top: rect.top * scaleY, bottom: rect.bottom * scaleY
                }
            }

            function clearLineMeasurementCacheFor(lineView) {
                if (lineView.measure) {
                    lineView.measure.cache = {};
                    lineView.measure.heights = null;
                    if (lineView.rest) {
                        for (var i = 0; i < lineView.rest.length; i++) {
                            lineView.measure.caches[i] = {};
                        }
                    }
                }
            }

            function clearLineMeasurementCache(cm) {
                cm.display.externalMeasure = null;
                removeChildren(cm.display.lineMeasure);
                for (var i = 0; i < cm.display.view.length; i++) {
                    clearLineMeasurementCacheFor(cm.display.view[i]);
                }
            }

            function clearCaches(cm) {
                clearLineMeasurementCache(cm);
                cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
                if (!cm.options.lineWrapping) {
                    cm.display.maxLineChanged = true;
                }
                cm.display.lineNumChars = null;
            }

            function pageScrollX() {
                // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
                // which causes page_Offset and bounding client rects to use
                // different reference viewports and invalidate our calculations.
                if (chrome && android) {
                    return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft))
                }
                return window.pageXOffset || (document.documentElement || document.body).scrollLeft
            }

            function pageScrollY() {
                if (chrome && android) {
                    return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop))
                }
                return window.pageYOffset || (document.documentElement || document.body).scrollTop
            }

            function widgetTopHeight(lineObj) {
                var height = 0;
                if (lineObj.widgets) {
                    for (var i = 0; i < lineObj.widgets.length; ++i) {
                        if (lineObj.widgets[i].above) {
                            height += widgetHeight(lineObj.widgets[i]);
                        }
                    }
                }
                return height
            }

            // Converts a {top, bottom, left, right} box from line-local
            // coordinates into another coordinate system. Context may be one of
            // "line", "div" (display.lineDiv), "local"./null (editor), "window",
            // or "page".
            function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
                if (!includeWidgets) {
                    var height = widgetTopHeight(lineObj);
                    rect.top += height;
                    rect.bottom += height;
                }
                if (context == "line") {
                    return rect
                }
                if (!context) {
                    context = "local";
                }
                var yOff = heightAtLine(lineObj);
                if (context == "local") {
                    yOff += paddingTop(cm.display);
                } else {
                    yOff -= cm.display.viewOffset;
                }
                if (context == "page" || context == "window") {
                    var lOff = cm.display.lineSpace.getBoundingClientRect();
                    yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
                    var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
                    rect.left += xOff;
                    rect.right += xOff;
                }
                rect.top += yOff;
                rect.bottom += yOff;
                return rect
            }

            // Coverts a box from "div" coords to another coordinate system.
            // Context may be "window", "page", "div", or "local"./null.
            function fromCoordSystem(cm, coords, context) {
                if (context == "div") {
                    return coords
                }
                var left = coords.left, top = coords.top;
                // First move into "page" coordinate system
                if (context == "page") {
                    left -= pageScrollX();
                    top -= pageScrollY();
                } else if (context == "local" || !context) {
                    var localBox = cm.display.sizer.getBoundingClientRect();
                    left += localBox.left;
                    top += localBox.top;
                }

                var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
                return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
            }

            function charCoords(cm, pos, context, lineObj, bias) {
                if (!lineObj) {
                    lineObj = getLine(cm.doc, pos.line);
                }
                return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
            }

            // Returns a box for a given cursor position, which may have an
            // 'other' property containing the position of the secondary cursor
            // on a bidi boundary.
            // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
            // and after `char - 1` in writing order of `char - 1`
            // A cursor Pos(line, char, "after") is on the same visual line as `char`
            // and before `char` in writing order of `char`
            // Examples (upper-case letters are RTL, lower-case are LTR):
            //     Pos(0, 1, ...)
            //     before   after
            // ab     a|b     a|b
            // aB     a|B     aB|
            // Ab     |Ab     A|b
            // AB     B|A     B|A
            // Every position after the last character on a line is considered to stick
            // to the last character on the line.
            function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
                lineObj = lineObj || getLine(cm.doc, pos.line);
                if (!preparedMeasure) {
                    preparedMeasure = prepareMeasureForLine(cm, lineObj);
                }

                function get(ch, right) {
                    var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
                    if (right) {
                        m.left = m.right;
                    } else {
                        m.right = m.left;
                    }
                    return intoCoordSystem(cm, lineObj, m, context)
                }

                var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;
                if (ch >= lineObj.text.length) {
                    ch = lineObj.text.length;
                    sticky = "before";
                } else if (ch <= 0) {
                    ch = 0;
                    sticky = "after";
                }
                if (!order) {
                    return get(sticky == "before" ? ch - 1 : ch, sticky == "before")
                }

                function getBidi(ch, partPos, invert) {
                    var part = order[partPos], right = part.level == 1;
                    return get(invert ? ch - 1 : ch, right != invert)
                }

                var partPos = getBidiPartAt(order, ch, sticky);
                var other = bidiOther;
                var val = getBidi(ch, partPos, sticky == "before");
                if (other != null) {
                    val.other = getBidi(ch, other, sticky != "before");
                }
                return val
            }

            // Used to cheaply estimate the coordinates for a position. Used for
            // intermediate scroll updates.
            function estimateCoords(cm, pos) {
                var left = 0;
                pos = clipPos(cm.doc, pos);
                if (!cm.options.lineWrapping) {
                    left = charWidth(cm.display) * pos.ch;
                }
                var lineObj = getLine(cm.doc, pos.line);
                var top = heightAtLine(lineObj) + paddingTop(cm.display);
                return {left: left, right: left, top: top, bottom: top + lineObj.height}
            }

            // Positions returned by coordsChar contain some extra information.
            // xRel is the relative x position of the input coordinates compared
            // to the found position (so xRel > 0 means the coordinates are to
            // the right of the character position, for example). When outside
            // is true, that means the coordinates lie outside the line's
            // vertical range.
            function PosWithInfo(line, ch, sticky, outside, xRel) {
                var pos = Pos(line, ch, sticky);
                pos.xRel = xRel;
                if (outside) {
                    pos.outside = true;
                }
                return pos
            }

            // Compute the character position closest to the given coordinates.
            // Input must be lineSpace-local ("div" coordinate system).
            function coordsChar(cm, x, y) {
                var doc = cm.doc;
                y += cm.display.viewOffset;
                if (y < 0) {
                    return PosWithInfo(doc.first, 0, null, true, -1)
                }
                var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
                if (lineN > last) {
                    return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1)
                }
                if (x < 0) {
                    x = 0;
                }

                var lineObj = getLine(doc, lineN);
                for (; ;) {
                    var found = coordsCharInner(cm, lineObj, lineN, x, y);
                    var collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 ? 1 : 0));
                    if (!collapsed) {
                        return found
                    }
                    var rangeEnd = collapsed.find(1);
                    if (rangeEnd.line == lineN) {
                        return rangeEnd
                    }
                    lineObj = getLine(doc, lineN = rangeEnd.line);
                }
            }

            function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
                y -= widgetTopHeight(lineObj);
                var end = lineObj.text.length;
                var begin = findFirst(function (ch) {
                    return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y;
                }, end, 0);
                end = findFirst(function (ch) {
                    return measureCharPrepared(cm, preparedMeasure, ch).top > y;
                }, begin, end);
                return {begin: begin, end: end}
            }

            function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
                if (!preparedMeasure) {
                    preparedMeasure = prepareMeasureForLine(cm, lineObj);
                }
                var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
                return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
            }

            // Returns true if the given side of a box is after the given
            // coordinates, in top-to-bottom, left-to-right order.
            function boxIsAfter(box, x, y, left) {
                return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
            }

            function coordsCharInner(cm, lineObj, lineNo$$1, x, y) {
                // Move y into line-local coordinate space
                y -= heightAtLine(lineObj);
                var preparedMeasure = prepareMeasureForLine(cm, lineObj);
                // When directly calling `measureCharPrepared`, we have to adjust
                // for the widgets at this line.
                var widgetHeight$$1 = widgetTopHeight(lineObj);
                var begin = 0, end = lineObj.text.length, ltr = true;

                var order = getOrder(lineObj, cm.doc.direction);
                // If the line isn't plain left-to-right text, first figure out
                // which bidi section the coordinates fall into.
                if (order) {
                    var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
                    (cm, lineObj, lineNo$$1, preparedMeasure, order, x, y);
                    ltr = part.level != 1;
                    // The awkward -1 offsets are needed because findFirst (called
                    // on these below) will treat its first bound as inclusive,
                    // second as exclusive, but we want to actually address the
                    // characters in the part's range
                    begin = ltr ? part.from : part.to - 1;
                    end = ltr ? part.to : part.from - 1;
                }

                // A binary search to find the first character whose bounding box
                // starts after the coordinates. If we run across any whose box wrap
                // the coordinates, store that.
                var chAround = null, boxAround = null;
                var ch = findFirst(function (ch) {
                    var box = measureCharPrepared(cm, preparedMeasure, ch);
                    box.top += widgetHeight$$1;
                    box.bottom += widgetHeight$$1;
                    if (!boxIsAfter(box, x, y, false)) {
                        return false
                    }
                    if (box.top <= y && box.left <= x) {
                        chAround = ch;
                        boxAround = box;
                    }
                    return true
                }, begin, end);

                var baseX, sticky, outside = false;
                // If a box around the coordinates was found, use that
                if (boxAround) {
                    // Distinguish coordinates nearer to the left or right side of the box
                    var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr;
                    ch = chAround + (atStart ? 0 : 1);
                    sticky = atStart ? "after" : "before";
                    baseX = atLeft ? boxAround.left : boxAround.right;
                } else {
                    // (Adjust for extended bound, if necessary.)
                    if (!ltr && (ch == end || ch == begin)) {
                        ch++;
                    }
                    // To determine which side to associate with, get the box to the
                    // left of the character and compare it's vertical position to the
                    // coordinates
                    sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
                        (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight$$1 <= y) == ltr ?
                            "after" : "before";
                    // Now get accurate coordinates for this place, in order to get a
                    // base X position
                    var coords = cursorCoords(cm, Pos(lineNo$$1, ch, sticky), "line", lineObj, preparedMeasure);
                    baseX = coords.left;
                    outside = y < coords.top || y >= coords.bottom;
                }

                ch = skipExtendingChars(lineObj.text, ch, 1);
                return PosWithInfo(lineNo$$1, ch, sticky, outside, x - baseX)
            }

            function coordsBidiPart(cm, lineObj, lineNo$$1, preparedMeasure, order, x, y) {
                // Bidi parts are sorted left-to-right, and in a non-line-wrapping
                // situation, we can take this ordering to correspond to the visual
                // ordering. This finds the first part whose end is after the given
                // coordinates.
                var index = findFirst(function (i) {
                    var part = order[i], ltr = part.level != 1;
                    return boxIsAfter(cursorCoords(cm, Pos(lineNo$$1, ltr ? part.to : part.from, ltr ? "before" : "after"),
                        "line", lineObj, preparedMeasure), x, y, true)
                }, 0, order.length - 1);
                var part = order[index];
                // If this isn't the first part, the part's start is also after
                // the coordinates, and the coordinates aren't on the same line as
                // that start, move one part back.
                if (index > 0) {
                    var ltr = part.level != 1;
                    var start = cursorCoords(cm, Pos(lineNo$$1, ltr ? part.from : part.to, ltr ? "after" : "before"),
                        "line", lineObj, preparedMeasure);
                    if (boxIsAfter(start, x, y, true) && start.top > y) {
                        part = order[index - 1];
                    }
                }
                return part
            }

            function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
                // In a wrapped line, rtl text on wrapping boundaries can do things
                // that don't correspond to the ordering in our `order` array at
                // all, so a binary search doesn't work, and we want to return a
                // part that only spans one line so that the binary search in
                // coordsCharInner is safe. As such, we first find the extent of the
                // wrapped line, and then do a flat search in which we discard any
                // spans that aren't on the line.
                var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
                var begin = ref.begin;
                var end = ref.end;
                if (/\s/.test(lineObj.text.charAt(end - 1))) {
                    end--;
                }
                var part = null, closestDist = null;
                for (var i = 0; i < order.length; i++) {
                    var p = order[i];
                    if (p.from >= end || p.to <= begin) {
                        continue
                    }
                    var ltr = p.level != 1;
                    var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;
                    // Weigh against spans ending before this, so that they are only
                    // picked if nothing ends after
                    var dist = endX < x ? x - endX + 1e9 : endX - x;
                    if (!part || closestDist > dist) {
                        part = p;
                        closestDist = dist;
                    }
                }
                if (!part) {
                    part = order[order.length - 1];
                }
                // Clip the part to the wrapped line.
                if (part.from < begin) {
                    part = {from: begin, to: part.to, level: part.level};
                }
                if (part.to > end) {
                    part = {from: part.from, to: end, level: part.level};
                }
                return part
            }

            var measureText;

            // Compute the default text height.
            function textHeight(display) {
                if (display.cachedTextHeight != null) {
                    return display.cachedTextHeight
                }
                if (measureText == null) {
                    measureText = elt("pre");
                    // Measure a bunch of lines, for browsers that compute
                    // fractional heights.
                    for (var i = 0; i < 49; ++i) {
                        measureText.appendChild(document.createTextNode("x"));
                        measureText.appendChild(elt("br"));
                    }
                    measureText.appendChild(document.createTextNode("x"));
                }
                removeChildrenAndAdd(display.measure, measureText);
                var height = measureText.offsetHeight / 50;
                if (height > 3) {
                    display.cachedTextHeight = height;
                }
                removeChildren(display.measure);
                return height || 1
            }

            // Compute the default character width.
            function charWidth(display) {
                if (display.cachedCharWidth != null) {
                    return display.cachedCharWidth
                }
                var anchor = elt("span", "xxxxxxxxxx");
                var pre = elt("pre", [anchor]);
                removeChildrenAndAdd(display.measure, pre);
                var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
                if (width > 2) {
                    display.cachedCharWidth = width;
                }
                return width || 10
            }

            // Do a bulk-read of the DOM positions and sizes needed to draw the
            // view, so that we don't interleave reading and writing to the DOM.
            function getDimensions(cm) {
                var d = cm.display, left = {}, width = {};
                var gutterLeft = d.gutters.clientLeft;
                for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
                    left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
                    width[cm.options.gutters[i]] = n.clientWidth;
                }
                return {
                    fixedPos: compensateForHScroll(d),
                    gutterTotalWidth: d.gutters.offsetWidth,
                    gutterLeft: left,
                    gutterWidth: width,
                    wrapperWidth: d.wrapper.clientWidth
                }
            }

            // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
            // but using getBoundingClientRect to get a sub-pixel-accurate
            // result.
            function compensateForHScroll(display) {
                return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
            }

            // Returns a function that estimates the height of a line, to use as
            // first approximation until the line becomes visible (and is thus
            // properly measurable).
            function estimateHeight(cm) {
                var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
                var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
                return function (line) {
                    if (lineIsHidden(cm.doc, line)) {
                        return 0
                    }

                    var widgetsHeight = 0;
                    if (line.widgets) {
                        for (var i = 0; i < line.widgets.length; i++) {
                            if (line.widgets[i].height) {
                                widgetsHeight += line.widgets[i].height;
                            }
                        }
                    }

                    if (wrapping) {
                        return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th
                    } else {
                        return widgetsHeight + th
                    }
                }
            }

            function estimateLineHeights(cm) {
                var doc = cm.doc, est = estimateHeight(cm);
                doc.iter(function (line) {
                    var estHeight = est(line);
                    if (estHeight != line.height) {
                        updateLineHeight(line, estHeight);
                    }
                });
            }

            // Given a mouse event, find the corresponding position. If liberal
            // is false, it checks whether a gutter or scrollbar was clicked,
            // and returns null if it was. forRect is used by rectangular
            // selections, and tries to estimate a character position even for
            // coordinates beyond the right of the text.
            function posFromMouse(cm, e, liberal, forRect) {
                var display = cm.display;
                if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") {
                    return null
                }

                var x, y, space = display.lineSpace.getBoundingClientRect();
                // Fails unpredictably on IE[67] when mouse is dragged around quickly.
                try {
                    x = e.clientX - space.left;
                    y = e.clientY - space.top;
                } catch (e) {
                    return null
                }
                var coords = coordsChar(cm, x, y), line;
                if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
                    var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
                    coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
                }
                return coords
            }

            // Find the view element corresponding to a given line. Return null
            // when the line isn't visible.
            function findViewIndex(cm, n) {
                if (n >= cm.display.viewTo) {
                    return null
                }
                n -= cm.display.viewFrom;
                if (n < 0) {
                    return null
                }
                var view = cm.display.view;
                for (var i = 0; i < view.length; i++) {
                    n -= view[i].size;
                    if (n < 0) {
                        return i
                    }
                }
            }

            function updateSelection(cm) {
                cm.display.input.showSelection(cm.display.input.prepareSelection());
            }

            function prepareSelection(cm, primary) {
                if (primary === void 0) primary = true;

                var doc = cm.doc, result = {};
                var curFragment = result.cursors = document.createDocumentFragment();
                var selFragment = result.selection = document.createDocumentFragment();

                for (var i = 0; i < doc.sel.ranges.length; i++) {
                    if (!primary && i == doc.sel.primIndex) {
                        continue
                    }
                    var range$$1 = doc.sel.ranges[i];
                    if (range$$1.from().line >= cm.display.viewTo || range$$1.to().line < cm.display.viewFrom) {
                        continue
                    }
                    var collapsed = range$$1.empty();
                    if (collapsed || cm.options.showCursorWhenSelecting) {
                        drawSelectionCursor(cm, range$$1.head, curFragment);
                    }
                    if (!collapsed) {
                        drawSelectionRange(cm, range$$1, selFragment);
                    }
                }
                return result
            }

            // Draws a cursor for the given range
            function drawSelectionCursor(cm, head, output) {
                var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);

                var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
                cursor.style.left = pos.left + "px";
                cursor.style.top = pos.top + "px";
                cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

                if (pos.other) {
                    // Secondary cursor, shown when on a 'jump' in bi-directional text
                    var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
                    otherCursor.style.display = "";
                    otherCursor.style.left = pos.other.left + "px";
                    otherCursor.style.top = pos.other.top + "px";
                    otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
                }
            }

            function cmpCoords(a, b) {
                return a.top - b.top || a.left - b.left
            }

            // Draws the given range as a highlighted selection
            function drawSelectionRange(cm, range$$1, output) {
                var display = cm.display, doc = cm.doc;
                var fragment = document.createDocumentFragment();
                var padding = paddingH(cm.display), leftSide = padding.left;
                var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
                var docLTR = doc.direction == "ltr";

                function add(left, top, width, bottom) {
                    if (top < 0) {
                        top = 0;
                    }
                    top = Math.round(top);
                    bottom = Math.round(bottom);
                    fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")));
                }

                function drawForLine(line, fromArg, toArg) {
                    var lineObj = getLine(doc, line);
                    var lineLen = lineObj.text.length;
                    var start, end;

                    function coords(ch, bias) {
                        return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
                    }

                    function wrapX(pos, dir, side) {
                        var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
                        var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
                        var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
                        return coords(ch, prop)[prop]
                    }

                    var order = getOrder(lineObj, doc.direction);
                    iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {
                        var ltr = dir == "ltr";
                        var fromPos = coords(from, ltr ? "left" : "right");
                        var toPos = coords(to - 1, ltr ? "right" : "left");

                        var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen;
                        var first = i == 0, last = !order || i == order.length - 1;
                        if (toPos.top - fromPos.top <= 3) { // Single line
                            var openLeft = (docLTR ? openStart : openEnd) && first;
                            var openRight = (docLTR ? openEnd : openStart) && last;
                            var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
                            var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
                            add(left, fromPos.top, right - left, fromPos.bottom);
                        } else { // Multiple lines
                            var topLeft, topRight, botLeft, botRight;
                            if (ltr) {
                                topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
                                topRight = docLTR ? rightSide : wrapX(from, dir, "before");
                                botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
                                botRight = docLTR && openEnd && last ? rightSide : toPos.right;
                            } else {
                                topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
                                topRight = !docLTR && openStart && first ? rightSide : fromPos.right;
                                botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
                                botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
                            }
                            add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
                            if (fromPos.bottom < toPos.top) {
                                add(leftSide, fromPos.bottom, null, toPos.top);
                            }
                            add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
                        }

                        if (!start || cmpCoords(fromPos, start) < 0) {
                            start = fromPos;
                        }
                        if (cmpCoords(toPos, start) < 0) {
                            start = toPos;
                        }
                        if (!end || cmpCoords(fromPos, end) < 0) {
                            end = fromPos;
                        }
                        if (cmpCoords(toPos, end) < 0) {
                            end = toPos;
                        }
                    });
                    return {start: start, end: end}
                }

                var sFrom = range$$1.from(), sTo = range$$1.to();
                if (sFrom.line == sTo.line) {
                    drawForLine(sFrom.line, sFrom.ch, sTo.ch);
                } else {
                    var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
                    var singleVLine = visualLine(fromLine) == visualLine(toLine);
                    var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
                    var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
                    if (singleVLine) {
                        if (leftEnd.top < rightStart.top - 2) {
                            add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
                            add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
                        } else {
                            add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
                        }
                    }
                    if (leftEnd.bottom < rightStart.top) {
                        add(leftSide, leftEnd.bottom, null, rightStart.top);
                    }
                }

                output.appendChild(fragment);
            }

            // Cursor-blinking
            function restartBlink(cm) {
                if (!cm.state.focused) {
                    return
                }
                var display = cm.display;
                clearInterval(display.blinker);
                var on = true;
                display.cursorDiv.style.visibility = "";
                if (cm.options.cursorBlinkRate > 0) {
                    display.blinker = setInterval(function () {
                            return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden";
                        },
                        cm.options.cursorBlinkRate);
                } else if (cm.options.cursorBlinkRate < 0) {
                    display.cursorDiv.style.visibility = "hidden";
                }
            }

            function ensureFocus(cm) {
                if (!cm.state.focused) {
                    cm.display.input.focus();
                    onFocus(cm);
                }
            }

            function delayBlurEvent(cm) {
                cm.state.delayingBlurEvent = true;
                setTimeout(function () {
                    if (cm.state.delayingBlurEvent) {
                        cm.state.delayingBlurEvent = false;
                        onBlur(cm);
                    }
                }, 100);
            }

            function onFocus(cm, e) {
                if (cm.state.delayingBlurEvent) {
                    cm.state.delayingBlurEvent = false;
                }

                if (cm.options.readOnly == "nocursor") {
                    return
                }
                if (!cm.state.focused) {
                    signal(cm, "focus", cm, e);
                    cm.state.focused = true;
                    addClass(cm.display.wrapper, "CodeMirror-focused");
                    // This test prevents this from firing when a context
                    // menu is closed (since the input reset would kill the
                    // select-all detection hack)
                    if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
                        cm.display.input.reset();
                        if (webkit) {
                            setTimeout(function () {
                                return cm.display.input.reset(true);
                            }, 20);
                        } // Issue #1730
                    }
                    cm.display.input.receivedFocus();
                }
                restartBlink(cm);
            }

            function onBlur(cm, e) {
                if (cm.state.delayingBlurEvent) {
                    return
                }

                if (cm.state.focused) {
                    signal(cm, "blur", cm, e);
                    cm.state.focused = false;
                    rmClass(cm.display.wrapper, "CodeMirror-focused");
                }
                clearInterval(cm.display.blinker);
                setTimeout(function () {
                    if (!cm.state.focused) {
                        cm.display.shift = false;
                    }
                }, 150);
            }

            // Read the actual heights of the rendered lines, and update their
            // stored heights to match.
            function updateHeightsInViewport(cm) {
                var display = cm.display;
                var prevBottom = display.lineDiv.offsetTop;
                for (var i = 0; i < display.view.length; i++) {
                    var cur = display.view[i], height = (void 0);
                    if (cur.hidden) {
                        continue
                    }
                    if (ie && ie_version < 8) {
                        var bot = cur.node.offsetTop + cur.node.offsetHeight;
                        height = bot - prevBottom;
                        prevBottom = bot;
                    } else {
                        var box = cur.node.getBoundingClientRect();
                        height = box.bottom - box.top;
                    }
                    var diff = cur.line.height - height;
                    if (height < 2) {
                        height = textHeight(display);
                    }
                    if (diff > .005 || diff < -.005) {
                        updateLineHeight(cur.line, height);
                        updateWidgetHeight(cur.line);
                        if (cur.rest) {
                            for (var j = 0; j < cur.rest.length; j++) {
                                updateWidgetHeight(cur.rest[j]);
                            }
                        }
                    }
                }
            }

            // Read and store the height of line widgets associated with the
            // given line.
            function updateWidgetHeight(line) {
                if (line.widgets) {
                    for (var i = 0; i < line.widgets.length; ++i) {
                        var w = line.widgets[i], parent = w.node.parentNode;
                        if (parent) {
                            w.height = parent.offsetHeight;
                        }
                    }
                }
            }

            // Compute the lines that are visible in a given viewport (defaults
            // the the current scroll position). viewport may contain top,
            // height, and ensure (see op.scrollToPos) properties.
            function visibleLines(display, doc, viewport) {
                var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
                top = Math.floor(top - paddingTop(display));
                var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;

                var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
                // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
                // forces those lines into the viewport (if possible).
                if (viewport && viewport.ensure) {
                    var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
                    if (ensureFrom < from) {
                        from = ensureFrom;
                        to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
                    } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
                        from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
                        to = ensureTo;
                    }
                }
                return {from: from, to: Math.max(to, from + 1)}
            }

            // Re-align line numbers and gutter marks to compensate for
            // horizontal scrolling.
            function alignHorizontally(cm) {
                var display = cm.display, view = display.view;
                if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) {
                    return
                }
                var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
                var gutterW = display.gutters.offsetWidth, left = comp + "px";
                for (var i = 0; i < view.length; i++) {
                    if (!view[i].hidden) {
                        if (cm.options.fixedGutter) {
                            if (view[i].gutter) {
                                view[i].gutter.style.left = left;
                            }
                            if (view[i].gutterBackground) {
                                view[i].gutterBackground.style.left = left;
                            }
                        }
                        var align = view[i].alignable;
                        if (align) {
                            for (var j = 0; j < align.length; j++) {
                                align[j].style.left = left;
                            }
                        }
                    }
                }
                if (cm.options.fixedGutter) {
                    display.gutters.style.left = (comp + gutterW) + "px";
                }
            }

            // Used to ensure that the line number gutter is still the right
            // size for the current document size. Returns true when an update
            // is needed.
            function maybeUpdateLineNumberWidth(cm) {
                if (!cm.options.lineNumbers) {
                    return false
                }
                var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
                if (last.length != display.lineNumChars) {
                    var test = display.measure.appendChild(elt("div", [elt("div", last)],
                        "CodeMirror-linenumber CodeMirror-gutter-elt"));
                    var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
                    display.lineGutter.style.width = "";
                    display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
                    display.lineNumWidth = display.lineNumInnerWidth + padding;
                    display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
                    display.lineGutter.style.width = display.lineNumWidth + "px";
                    updateGutterSpace(cm);
                    return true
                }
                return false
            }

            // SCROLLING THINGS INTO VIEW

            // If an editor sits on the top or bottom of the window, partially
            // scrolled out of view, this ensures that the cursor is visible.
            function maybeScrollWindow(cm, rect) {
                if (signalDOMEvent(cm, "scrollCursorIntoView")) {
                    return
                }

                var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
                if (rect.top + box.top < 0) {
                    doScroll = true;
                } else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) {
                    doScroll = false;
                }
                if (doScroll != null && !phantom) {
                    var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"));
                    cm.display.lineSpace.appendChild(scrollNode);
                    scrollNode.scrollIntoView(doScroll);
                    cm.display.lineSpace.removeChild(scrollNode);
                }
            }

            // Scroll a given position into view (immediately), verifying that
            // it actually became visible (as line heights are accurately
            // measured, the position of something may 'drift' during drawing).
            function scrollPosIntoView(cm, pos, end, margin) {
                if (margin == null) {
                    margin = 0;
                }
                var rect;
                if (!cm.options.lineWrapping && pos == end) {
                    // Set pos and end to the cursor positions around the character pos sticks to
                    // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
                    // If pos == Pos(_, 0, "before"), pos and end are unchanged
                    pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
                    end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
                }
                for (var limit = 0; limit < 5; limit++) {
                    var changed = false;
                    var coords = cursorCoords(cm, pos);
                    var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
                    rect = {
                        left: Math.min(coords.left, endCoords.left),
                        top: Math.min(coords.top, endCoords.top) - margin,
                        right: Math.max(coords.left, endCoords.left),
                        bottom: Math.max(coords.bottom, endCoords.bottom) + margin
                    };
                    var scrollPos = calculateScrollPos(cm, rect);
                    var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
                    if (scrollPos.scrollTop != null) {
                        updateScrollTop(cm, scrollPos.scrollTop);
                        if (Math.abs(cm.doc.scrollTop - startTop) > 1) {
                            changed = true;
                        }
                    }
                    if (scrollPos.scrollLeft != null) {
                        setScrollLeft(cm, scrollPos.scrollLeft);
                        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) {
                            changed = true;
                        }
                    }
                    if (!changed) {
                        break
                    }
                }
                return rect
            }

            // Scroll a given set of coordinates into view (immediately).
            function scrollIntoView(cm, rect) {
                var scrollPos = calculateScrollPos(cm, rect);
                if (scrollPos.scrollTop != null) {
                    updateScrollTop(cm, scrollPos.scrollTop);
                }
                if (scrollPos.scrollLeft != null) {
                    setScrollLeft(cm, scrollPos.scrollLeft);
                }
            }

            // Calculate a new scroll position needed to scroll the given
            // rectangle into view. Returns an object with scrollTop and
            // scrollLeft properties. When these are undefined, the
            // vertical/horizontal position does not need to be adjusted.
            function calculateScrollPos(cm, rect) {
                var display = cm.display, snapMargin = textHeight(cm.display);
                if (rect.top < 0) {
                    rect.top = 0;
                }
                var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
                var screen = displayHeight(cm), result = {};
                if (rect.bottom - rect.top > screen) {
                    rect.bottom = rect.top + screen;
                }
                var docBottom = cm.doc.height + paddingVert(display);
                var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;
                if (rect.top < screentop) {
                    result.scrollTop = atTop ? 0 : rect.top;
                } else if (rect.bottom > screentop + screen) {
                    var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
                    if (newTop != screentop) {
                        result.scrollTop = newTop;
                    }
                }

                var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
                var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
                var tooWide = rect.right - rect.left > screenw;
                if (tooWide) {
                    rect.right = rect.left + screenw;
                }
                if (rect.left < 10) {
                    result.scrollLeft = 0;
                } else if (rect.left < screenleft) {
                    result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10));
                } else if (rect.right > screenw + screenleft - 3) {
                    result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw;
                }
                return result
            }

            // Store a relative adjustment to the scroll position in the current
            // operation (to be applied when the operation finishes).
            function addToScrollTop(cm, top) {
                if (top == null) {
                    return
                }
                resolveScrollToPos(cm);
                cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
            }

            // Make sure that at the end of the operation the current cursor is
            // shown.
            function ensureCursorVisible(cm) {
                resolveScrollToPos(cm);
                var cur = cm.getCursor();
                cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin};
            }

            function scrollToCoords(cm, x, y) {
                if (x != null || y != null) {
                    resolveScrollToPos(cm);
                }
                if (x != null) {
                    cm.curOp.scrollLeft = x;
                }
                if (y != null) {
                    cm.curOp.scrollTop = y;
                }
            }

            function scrollToRange(cm, range$$1) {
                resolveScrollToPos(cm);
                cm.curOp.scrollToPos = range$$1;
            }

            // When an operation has its scrollToPos property set, and another
            // scroll action is applied before the end of the operation, this
            // 'simulates' scrolling that position into view in a cheap way, so
            // that the effect of intermediate scroll commands is not ignored.
            function resolveScrollToPos(cm) {
                var range$$1 = cm.curOp.scrollToPos;
                if (range$$1) {
                    cm.curOp.scrollToPos = null;
                    var from = estimateCoords(cm, range$$1.from), to = estimateCoords(cm, range$$1.to);
                    scrollToCoordsRange(cm, from, to, range$$1.margin);
                }
            }

            function scrollToCoordsRange(cm, from, to, margin) {
                var sPos = calculateScrollPos(cm, {
                    left: Math.min(from.left, to.left),
                    top: Math.min(from.top, to.top) - margin,
                    right: Math.max(from.right, to.right),
                    bottom: Math.max(from.bottom, to.bottom) + margin
                });
                scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
            }

            // Sync the scrollable area and scrollbars, ensure the viewport
            // covers the visible area.
            function updateScrollTop(cm, val) {
                if (Math.abs(cm.doc.scrollTop - val) < 2) {
                    return
                }
                if (!gecko) {
                    updateDisplaySimple(cm, {top: val});
                }
                setScrollTop(cm, val, true);
                if (gecko) {
                    updateDisplaySimple(cm);
                }
                startWorker(cm, 100);
            }

            function setScrollTop(cm, val, forceScroll) {
                val = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val);
                if (cm.display.scroller.scrollTop == val && !forceScroll) {
                    return
                }
                cm.doc.scrollTop = val;
                cm.display.scrollbars.setScrollTop(val);
                if (cm.display.scroller.scrollTop != val) {
                    cm.display.scroller.scrollTop = val;
                }
            }

            // Sync scroller and scrollbar, ensure the gutter elements are
            // aligned.
            function setScrollLeft(cm, val, isScroller, forceScroll) {
                val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
                if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) {
                    return
                }
                cm.doc.scrollLeft = val;
                alignHorizontally(cm);
                if (cm.display.scroller.scrollLeft != val) {
                    cm.display.scroller.scrollLeft = val;
                }
                cm.display.scrollbars.setScrollLeft(val);
            }

            // SCROLLBARS

            // Prepare DOM reads needed to update the scrollbars. Done in one
            // shot to minimize update/measure roundtrips.
            function measureForScrollbars(cm) {
                var d = cm.display, gutterW = d.gutters.offsetWidth;
                var docH = Math.round(cm.doc.height + paddingVert(cm.display));
                return {
                    clientHeight: d.scroller.clientHeight,
                    viewHeight: d.wrapper.clientHeight,
                    scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
                    viewWidth: d.wrapper.clientWidth,
                    barLeft: cm.options.fixedGutter ? gutterW : 0,
                    docHeight: docH,
                    scrollHeight: docH + scrollGap(cm) + d.barHeight,
                    nativeBarWidth: d.nativeBarWidth,
                    gutterWidth: gutterW
                }
            }

            var NativeScrollbars = function (place, scroll, cm) {
                this.cm = cm;
                var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
                var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
                vert.tabIndex = horiz.tabIndex = -1;
                place(vert);
                place(horiz);

                on(vert, "scroll", function () {
                    if (vert.clientHeight) {
                        scroll(vert.scrollTop, "vertical");
                    }
                });
                on(horiz, "scroll", function () {
                    if (horiz.clientWidth) {
                        scroll(horiz.scrollLeft, "horizontal");
                    }
                });

                this.checkedZeroWidth = false;
                // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
                if (ie && ie_version < 8) {
                    this.horiz.style.minHeight = this.vert.style.minWidth = "18px";
                }
            };

            NativeScrollbars.prototype.update = function (measure) {
                var needsH = measure.scrollWidth > measure.clientWidth + 1;
                var needsV = measure.scrollHeight > measure.clientHeight + 1;
                var sWidth = measure.nativeBarWidth;

                if (needsV) {
                    this.vert.style.display = "block";
                    this.vert.style.bottom = needsH ? sWidth + "px" : "0";
                    var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
                    // A bug in IE8 can cause this value to be negative, so guard it.
                    this.vert.firstChild.style.height =
                        Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
                } else {
                    this.vert.style.display = "";
                    this.vert.firstChild.style.height = "0";
                }

                if (needsH) {
                    this.horiz.style.display = "block";
                    this.horiz.style.right = needsV ? sWidth + "px" : "0";
                    this.horiz.style.left = measure.barLeft + "px";
                    var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
                    this.horiz.firstChild.style.width =
                        Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
                } else {
                    this.horiz.style.display = "";
                    this.horiz.firstChild.style.width = "0";
                }

                if (!this.checkedZeroWidth && measure.clientHeight > 0) {
                    if (sWidth == 0) {
                        this.zeroWidthHack();
                    }
                    this.checkedZeroWidth = true;
                }

                return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
            };

            NativeScrollbars.prototype.setScrollLeft = function (pos) {
                if (this.horiz.scrollLeft != pos) {
                    this.horiz.scrollLeft = pos;
                }
                if (this.disableHoriz) {
                    this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz");
                }
            };

            NativeScrollbars.prototype.setScrollTop = function (pos) {
                if (this.vert.scrollTop != pos) {
                    this.vert.scrollTop = pos;
                }
                if (this.disableVert) {
                    this.enableZeroWidthBar(this.vert, this.disableVert, "vert");
                }
            };

            NativeScrollbars.prototype.zeroWidthHack = function () {
                var w = mac && !mac_geMountainLion ? "12px" : "18px";
                this.horiz.style.height = this.vert.style.width = w;
                this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
                this.disableHoriz = new Delayed;
                this.disableVert = new Delayed;
            };

            NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
                bar.style.pointerEvents = "auto";

                function maybeDisable() {
                    // To find out whether the scrollbar is still visible, we
                    // check whether the element under the pixel in the bottom
                    // right corner of the scrollbar box is the scrollbar box
                    // itself (when the bar is still visible) or its filler child
                    // (when the bar is hidden). If it is still visible, we keep
                    // it enabled, if it's hidden, we disable pointer events.
                    var box = bar.getBoundingClientRect();
                    var elt$$1 = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
                        : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
                    if (elt$$1 != bar) {
                        bar.style.pointerEvents = "none";
                    } else {
                        delay.set(1000, maybeDisable);
                    }
                }

                delay.set(1000, maybeDisable);
            };

            NativeScrollbars.prototype.clear = function () {
                var parent = this.horiz.parentNode;
                parent.removeChild(this.horiz);
                parent.removeChild(this.vert);
            };

            var NullScrollbars = function () {
            };

            NullScrollbars.prototype.update = function () {
                return {bottom: 0, right: 0}
            };
            NullScrollbars.prototype.setScrollLeft = function () {
            };
            NullScrollbars.prototype.setScrollTop = function () {
            };
            NullScrollbars.prototype.clear = function () {
            };

            function updateScrollbars(cm, measure) {
                if (!measure) {
                    measure = measureForScrollbars(cm);
                }
                var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
                updateScrollbarsInner(cm, measure);
                for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
                    if (startWidth != cm.display.barWidth && cm.options.lineWrapping) {
                        updateHeightsInViewport(cm);
                    }
                    updateScrollbarsInner(cm, measureForScrollbars(cm));
                    startWidth = cm.display.barWidth;
                    startHeight = cm.display.barHeight;
                }
            }

            // Re-synchronize the fake scrollbars with the actual size of the
            // content.
            function updateScrollbarsInner(cm, measure) {
                var d = cm.display;
                var sizes = d.scrollbars.update(measure);

                d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
                d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
                d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";

                if (sizes.right && sizes.bottom) {
                    d.scrollbarFiller.style.display = "block";
                    d.scrollbarFiller.style.height = sizes.bottom + "px";
                    d.scrollbarFiller.style.width = sizes.right + "px";
                } else {
                    d.scrollbarFiller.style.display = "";
                }
                if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
                    d.gutterFiller.style.display = "block";
                    d.gutterFiller.style.height = sizes.bottom + "px";
                    d.gutterFiller.style.width = measure.gutterWidth + "px";
                } else {
                    d.gutterFiller.style.display = "";
                }
            }

            var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};

            function initScrollbars(cm) {
                if (cm.display.scrollbars) {
                    cm.display.scrollbars.clear();
                    if (cm.display.scrollbars.addClass) {
                        rmClass(cm.display.wrapper, cm.display.scrollbars.addClass);
                    }
                }

                cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
                    cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
                    // Prevent clicks in the scrollbars from killing focus
                    on(node, "mousedown", function () {
                        if (cm.state.focused) {
                            setTimeout(function () {
                                return cm.display.input.focus();
                            }, 0);
                        }
                    });
                    node.setAttribute("cm-not-content", "true");
                }, function (pos, axis) {
                    if (axis == "horizontal") {
                        setScrollLeft(cm, pos);
                    } else {
                        updateScrollTop(cm, pos);
                    }
                }, cm);
                if (cm.display.scrollbars.addClass) {
                    addClass(cm.display.wrapper, cm.display.scrollbars.addClass);
                }
            }

            // Operations are used to wrap a series of changes to the editor
            // state in such a way that each change won't have to update the
            // cursor and display (which would be awkward, slow, and
            // error-prone). Instead, display updates are batched and then all
            // combined and executed at once.

            var nextOpId = 0;

            // Start a new operation.
            function startOperation(cm) {
                cm.curOp = {
                    cm: cm,
                    viewChanged: false,      // Flag that indicates that lines might need to be redrawn
                    startHeight: cm.doc.height, // Used to detect need to update scrollbar
                    forceUpdate: false,      // Used to force a redraw
                    updateInput: null,       // Whether to reset the input textarea
                    typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
                    changeObjs: null,        // Accumulated changes, for firing change events
                    cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
                    cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
                    selectionChanged: false, // Whether the selection needs to be redrawn
                    updateMaxLine: false,    // Set when the widest line needs to be determined anew
                    scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
                    scrollToPos: null,       // Used to scroll to a specific position
                    focus: false,
                    id: ++nextOpId           // Unique ID
                };
                pushOperation(cm.curOp);
            }

            // Finish an operation, updating the display and signalling delayed events
            function endOperation(cm) {
                var op = cm.curOp;
                if (op) {
                    finishOperation(op, function (group) {
                        for (var i = 0; i < group.ops.length; i++) {
                            group.ops[i].cm.curOp = null;
                        }
                        endOperations(group);
                    });
                }
            }

            // The DOM updates done when an operation finishes are batched so
            // that the minimum number of relayouts are required.
            function endOperations(group) {
                var ops = group.ops;
                for (var i = 0; i < ops.length; i++) // Read DOM
                {
                    endOperation_R1(ops[i]);
                }
                for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
                {
                    endOperation_W1(ops[i$1]);
                }
                for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
                {
                    endOperation_R2(ops[i$2]);
                }
                for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
                {
                    endOperation_W2(ops[i$3]);
                }
                for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
                {
                    endOperation_finish(ops[i$4]);
                }
            }

            function endOperation_R1(op) {
                var cm = op.cm, display = cm.display;
                maybeClipScrollbars(cm);
                if (op.updateMaxLine) {
                    findMaxLine(cm);
                }

                op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
                    op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
                        op.scrollToPos.to.line >= display.viewTo) ||
                    display.maxLineChanged && cm.options.lineWrapping;
                op.update = op.mustUpdate &&
                    new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
            }

            function endOperation_W1(op) {
                op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
            }

            function endOperation_R2(op) {
                var cm = op.cm, display = cm.display;
                if (op.updatedDisplay) {
                    updateHeightsInViewport(cm);
                }

                op.barMeasure = measureForScrollbars(cm);

                // If the max line changed since it was last measured, measure it,
                // and ensure the document's width matches it.
                // updateDisplay_W2 will use these properties to do the actual resizing
                if (display.maxLineChanged && !cm.options.lineWrapping) {
                    op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
                    cm.display.sizerWidth = op.adjustWidthTo;
                    op.barMeasure.scrollWidth =
                        Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
                    op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
                }

                if (op.updatedDisplay || op.selectionChanged) {
                    op.preparedSelection = display.input.prepareSelection();
                }
            }

            function endOperation_W2(op) {
                var cm = op.cm;

                if (op.adjustWidthTo != null) {
                    cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
                    if (op.maxScrollLeft < cm.doc.scrollLeft) {
                        setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true);
                    }
                    cm.display.maxLineChanged = false;
                }

                var takeFocus = op.focus && op.focus == activeElt();
                if (op.preparedSelection) {
                    cm.display.input.showSelection(op.preparedSelection, takeFocus);
                }
                if (op.updatedDisplay || op.startHeight != cm.doc.height) {
                    updateScrollbars(cm, op.barMeasure);
                }
                if (op.updatedDisplay) {
                    setDocumentHeight(cm, op.barMeasure);
                }

                if (op.selectionChanged) {
                    restartBlink(cm);
                }

                if (cm.state.focused && op.updateInput) {
                    cm.display.input.reset(op.typing);
                }
                if (takeFocus) {
                    ensureFocus(op.cm);
                }
            }

            function endOperation_finish(op) {
                var cm = op.cm, display = cm.display, doc = cm.doc;

                if (op.updatedDisplay) {
                    postUpdateDisplay(cm, op.update);
                }

                // Abort mouse wheel delta measurement, when scrolling explicitly
                if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos)) {
                    display.wheelStartX = display.wheelStartY = null;
                }

                // Propagate the scroll position to the actual DOM scroller
                if (op.scrollTop != null) {
                    setScrollTop(cm, op.scrollTop, op.forceScroll);
                }

                if (op.scrollLeft != null) {
                    setScrollLeft(cm, op.scrollLeft, true, true);
                }
                // If we need to scroll a specific position into view, do so.
                if (op.scrollToPos) {
                    var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
                        clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
                    maybeScrollWindow(cm, rect);
                }

                // Fire events for markers that are hidden/unidden by editing or
                // undoing
                var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
                if (hidden) {
                    for (var i = 0; i < hidden.length; ++i) {
                        if (!hidden[i].lines.length) {
                            signal(hidden[i], "hide");
                        }
                    }
                }
                if (unhidden) {
                    for (var i$1 = 0; i$1 < unhidden.length; ++i$1) {
                        if (unhidden[i$1].lines.length) {
                            signal(unhidden[i$1], "unhide");
                        }
                    }
                }

                if (display.wrapper.offsetHeight) {
                    doc.scrollTop = cm.display.scroller.scrollTop;
                }

                // Fire change events, and delayed event handlers
                if (op.changeObjs) {
                    signal(cm, "changes", cm, op.changeObjs);
                }
                if (op.update) {
                    op.update.finish();
                }
            }

            // Run the given function in an operation
            function runInOp(cm, f) {
                if (cm.curOp) {
                    return f()
                }
                startOperation(cm);
                try {
                    return f()
                } finally {
                    endOperation(cm);
                }
            }

            // Wraps a function in an operation. Returns the wrapped function.
            function operation(cm, f) {
                return function () {
                    if (cm.curOp) {
                        return f.apply(cm, arguments)
                    }
                    startOperation(cm);
                    try {
                        return f.apply(cm, arguments)
                    } finally {
                        endOperation(cm);
                    }
                }
            }

            // Used to add methods to editor and doc instances, wrapping them in
            // operations.
            function methodOp(f) {
                return function () {
                    if (this.curOp) {
                        return f.apply(this, arguments)
                    }
                    startOperation(this);
                    try {
                        return f.apply(this, arguments)
                    } finally {
                        endOperation(this);
                    }
                }
            }

            function docMethodOp(f) {
                return function () {
                    var cm = this.cm;
                    if (!cm || cm.curOp) {
                        return f.apply(this, arguments)
                    }
                    startOperation(cm);
                    try {
                        return f.apply(this, arguments)
                    } finally {
                        endOperation(cm);
                    }
                }
            }

            // Updates the display.view data structure for a given change to the
            // document. From and to are in pre-change coordinates. Lendiff is
            // the amount of lines added or subtracted by the change. This is
            // used for changes that span multiple lines, or change the way
            // lines are divided into visual lines. regLineChange (below)
            // registers single-line changes.
            function regChange(cm, from, to, lendiff) {
                if (from == null) {
                    from = cm.doc.first;
                }
                if (to == null) {
                    to = cm.doc.first + cm.doc.size;
                }
                if (!lendiff) {
                    lendiff = 0;
                }

                var display = cm.display;
                if (lendiff && to < display.viewTo &&
                    (display.updateLineNumbers == null || display.updateLineNumbers > from)) {
                    display.updateLineNumbers = from;
                }

                cm.curOp.viewChanged = true;

                if (from >= display.viewTo) { // Change after
                    if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo) {
                        resetView(cm);
                    }
                } else if (to <= display.viewFrom) { // Change before
                    if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
                        resetView(cm);
                    } else {
                        display.viewFrom += lendiff;
                        display.viewTo += lendiff;
                    }
                } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
                    resetView(cm);
                } else if (from <= display.viewFrom) { // Top overlap
                    var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
                    if (cut) {
                        display.view = display.view.slice(cut.index);
                        display.viewFrom = cut.lineN;
                        display.viewTo += lendiff;
                    } else {
                        resetView(cm);
                    }
                } else if (to >= display.viewTo) { // Bottom overlap
                    var cut$1 = viewCuttingPoint(cm, from, from, -1);
                    if (cut$1) {
                        display.view = display.view.slice(0, cut$1.index);
                        display.viewTo = cut$1.lineN;
                    } else {
                        resetView(cm);
                    }
                } else { // Gap in the middle
                    var cutTop = viewCuttingPoint(cm, from, from, -1);
                    var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
                    if (cutTop && cutBot) {
                        display.view = display.view.slice(0, cutTop.index)
                            .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
                            .concat(display.view.slice(cutBot.index));
                        display.viewTo += lendiff;
                    } else {
                        resetView(cm);
                    }
                }

                var ext = display.externalMeasured;
                if (ext) {
                    if (to < ext.lineN) {
                        ext.lineN += lendiff;
                    } else if (from < ext.lineN + ext.size) {
                        display.externalMeasured = null;
                    }
                }
            }

            // Register a change to a single line. Type must be one of "text",
            // "gutter", "class", "widget"
            function regLineChange(cm, line, type) {
                cm.curOp.viewChanged = true;
                var display = cm.display, ext = cm.display.externalMeasured;
                if (ext && line >= ext.lineN && line < ext.lineN + ext.size) {
                    display.externalMeasured = null;
                }

                if (line < display.viewFrom || line >= display.viewTo) {
                    return
                }
                var lineView = display.view[findViewIndex(cm, line)];
                if (lineView.node == null) {
                    return
                }
                var arr = lineView.changes || (lineView.changes = []);
                if (indexOf(arr, type) == -1) {
                    arr.push(type);
                }
            }

            // Clear the view.
            function resetView(cm) {
                cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
                cm.display.view = [];
                cm.display.viewOffset = 0;
            }

            function viewCuttingPoint(cm, oldN, newN, dir) {
                var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
                if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size) {
                    return {index: index, lineN: newN}
                }
                var n = cm.display.viewFrom;
                for (var i = 0; i < index; i++) {
                    n += view[i].size;
                }
                if (n != oldN) {
                    if (dir > 0) {
                        if (index == view.length - 1) {
                            return null
                        }
                        diff = (n + view[index].size) - oldN;
                        index++;
                    } else {
                        diff = n - oldN;
                    }
                    oldN += diff;
                    newN += diff;
                }
                while (visualLineNo(cm.doc, newN) != newN) {
                    if (index == (dir < 0 ? 0 : view.length - 1)) {
                        return null
                    }
                    newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
                    index += dir;
                }
                return {index: index, lineN: newN}
            }

            // Force the view to cover a given range, adding empty view element
            // or clipping off existing ones as needed.
            function adjustView(cm, from, to) {
                var display = cm.display, view = display.view;
                if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
                    display.view = buildViewArray(cm, from, to);
                    display.viewFrom = from;
                } else {
                    if (display.viewFrom > from) {
                        display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view);
                    } else if (display.viewFrom < from) {
                        display.view = display.view.slice(findViewIndex(cm, from));
                    }
                    display.viewFrom = from;
                    if (display.viewTo < to) {
                        display.view = display.view.concat(buildViewArray(cm, display.viewTo, to));
                    } else if (display.viewTo > to) {
                        display.view = display.view.slice(0, findViewIndex(cm, to));
                    }
                }
                display.viewTo = to;
            }

            // Count the number of lines in the view whose DOM representation is
            // out of date (or nonexistent).
            function countDirtyView(cm) {
                var view = cm.display.view, dirty = 0;
                for (var i = 0; i < view.length; i++) {
                    var lineView = view[i];
                    if (!lineView.hidden && (!lineView.node || lineView.changes)) {
                        ++dirty;
                    }
                }
                return dirty
            }

            // HIGHLIGHT WORKER

            function startWorker(cm, time) {
                if (cm.doc.highlightFrontier < cm.display.viewTo) {
                    cm.state.highlight.set(time, bind(highlightWorker, cm));
                }
            }

            function highlightWorker(cm) {
                var doc = cm.doc;
                if (doc.highlightFrontier >= cm.display.viewTo) {
                    return
                }
                var end = +new Date + cm.options.workTime;
                var context = getContextBefore(cm, doc.highlightFrontier);
                var changedLines = [];

                doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
                    if (context.line >= cm.display.viewFrom) { // Visible
                        var oldStyles = line.styles;
                        var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
                        var highlighted = highlightLine(cm, line, context, true);
                        if (resetState) {
                            context.state = resetState;
                        }
                        line.styles = highlighted.styles;
                        var oldCls = line.styleClasses, newCls = highlighted.classes;
                        if (newCls) {
                            line.styleClasses = newCls;
                        } else if (oldCls) {
                            line.styleClasses = null;
                        }
                        var ischange = !oldStyles || oldStyles.length != line.styles.length ||
                            oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
                        for (var i = 0; !ischange && i < oldStyles.length; ++i) {
                            ischange = oldStyles[i] != line.styles[i];
                        }
                        if (ischange) {
                            changedLines.push(context.line);
                        }
                        line.stateAfter = context.save();
                        context.nextLine();
                    } else {
                        if (line.text.length <= cm.options.maxHighlightLength) {
                            processLine(cm, line.text, context);
                        }
                        line.stateAfter = context.line % 5 == 0 ? context.save() : null;
                        context.nextLine();
                    }
                    if (+new Date > end) {
                        startWorker(cm, cm.options.workDelay);
                        return true
                    }
                });
                doc.highlightFrontier = context.line;
                doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
                if (changedLines.length) {
                    runInOp(cm, function () {
                        for (var i = 0; i < changedLines.length; i++) {
                            regLineChange(cm, changedLines[i], "text");
                        }
                    });
                }
            }

            // DISPLAY DRAWING

            var DisplayUpdate = function (cm, viewport, force) {
                var display = cm.display;

                this.viewport = viewport;
                // Store some values that we'll need later (but don't want to force a relayout for)
                this.visible = visibleLines(display, cm.doc, viewport);
                this.editorIsHidden = !display.wrapper.offsetWidth;
                this.wrapperHeight = display.wrapper.clientHeight;
                this.wrapperWidth = display.wrapper.clientWidth;
                this.oldDisplayWidth = displayWidth(cm);
                this.force = force;
                this.dims = getDimensions(cm);
                this.events = [];
            };

            DisplayUpdate.prototype.signal = function (emitter, type) {
                if (hasHandler(emitter, type)) {
                    this.events.push(arguments);
                }
            };
            DisplayUpdate.prototype.finish = function () {
                var this$1 = this;

                for (var i = 0; i < this.events.length; i++) {
                    signal.apply(null, this$1.events[i]);
                }
            };

            function maybeClipScrollbars(cm) {
                var display = cm.display;
                if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
                    display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
                    display.heightForcer.style.height = scrollGap(cm) + "px";
                    display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
                    display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
                    display.scrollbarsClipped = true;
                }
            }

            function selectionSnapshot(cm) {
                if (cm.hasFocus()) {
                    return null
                }
                var active = activeElt();
                if (!active || !contains(cm.display.lineDiv, active)) {
                    return null
                }
                var result = {activeElt: active};
                if (window.getSelection) {
                    var sel = window.getSelection();
                    if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
                        result.anchorNode = sel.anchorNode;
                        result.anchorOffset = sel.anchorOffset;
                        result.focusNode = sel.focusNode;
                        result.focusOffset = sel.focusOffset;
                    }
                }
                return result
            }

            function restoreSelection(snapshot) {
                if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) {
                    return
                }
                snapshot.activeElt.focus();
                if (snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
                    var sel = window.getSelection(), range$$1 = document.createRange();
                    range$$1.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
                    range$$1.collapse(false);
                    sel.removeAllRanges();
                    sel.addRange(range$$1);
                    sel.extend(snapshot.focusNode, snapshot.focusOffset);
                }
            }

            // Does the actual updating of the line display. Bails out
            // (returning false) when there is nothing to be done and forced is
            // false.
            function updateDisplayIfNeeded(cm, update) {
                var display = cm.display, doc = cm.doc;

                if (update.editorIsHidden) {
                    resetView(cm);
                    return false
                }

                // Bail out if the visible area is already rendered and nothing changed.
                if (!update.force &&
                    update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
                    (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
                    display.renderedView == display.view && countDirtyView(cm) == 0) {
                    return false
                }

                if (maybeUpdateLineNumberWidth(cm)) {
                    resetView(cm);
                    update.dims = getDimensions(cm);
                }

                // Compute a suitable new viewport (from & to)
                var end = doc.first + doc.size;
                var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
                var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
                if (display.viewFrom < from && from - display.viewFrom < 20) {
                    from = Math.max(doc.first, display.viewFrom);
                }
                if (display.viewTo > to && display.viewTo - to < 20) {
                    to = Math.min(end, display.viewTo);
                }
                if (sawCollapsedSpans) {
                    from = visualLineNo(cm.doc, from);
                    to = visualLineEndNo(cm.doc, to);
                }

                var different = from != display.viewFrom || to != display.viewTo ||
                    display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
                adjustView(cm, from, to);

                display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
                // Position the mover div to align with the current scroll position
                cm.display.mover.style.top = display.viewOffset + "px";

                var toUpdate = countDirtyView(cm);
                if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
                    (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo)) {
                    return false
                }

                // For big changes, we hide the enclosing element during the
                // update, since that speeds up the operations on most browsers.
                var selSnapshot = selectionSnapshot(cm);
                if (toUpdate > 4) {
                    display.lineDiv.style.display = "none";
                }
                patchDisplay(cm, display.updateLineNumbers, update.dims);
                if (toUpdate > 4) {
                    display.lineDiv.style.display = "";
                }
                display.renderedView = display.view;
                // There might have been a widget with a focused element that got
                // hidden or updated, if so re-focus it.
                restoreSelection(selSnapshot);

                // Prevent selection and cursors from interfering with the scroll
                // width and height.
                removeChildren(display.cursorDiv);
                removeChildren(display.selectionDiv);
                display.gutters.style.height = display.sizer.style.minHeight = 0;

                if (different) {
                    display.lastWrapHeight = update.wrapperHeight;
                    display.lastWrapWidth = update.wrapperWidth;
                    startWorker(cm, 400);
                }

                display.updateLineNumbers = null;

                return true
            }

            function postUpdateDisplay(cm, update) {
                var viewport = update.viewport;

                for (var first = true; ; first = false) {
                    if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
                        // Clip forced viewport to actual scrollable area.
                        if (viewport && viewport.top != null) {
                            viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)};
                        }
                        // Updated line heights might result in the drawn area not
                        // actually covering the viewport. Keep looping until it does.
                        update.visible = visibleLines(cm.display, cm.doc, viewport);
                        if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo) {
                            break
                        }
                    }
                    if (!updateDisplayIfNeeded(cm, update)) {
                        break
                    }
                    updateHeightsInViewport(cm);
                    var barMeasure = measureForScrollbars(cm);
                    updateSelection(cm);
                    updateScrollbars(cm, barMeasure);
                    setDocumentHeight(cm, barMeasure);
                    update.force = false;
                }

                update.signal(cm, "update", cm);
                if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
                    update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
                    cm.display.reportedViewFrom = cm.display.viewFrom;
                    cm.display.reportedViewTo = cm.display.viewTo;
                }
            }

            function updateDisplaySimple(cm, viewport) {
                var update = new DisplayUpdate(cm, viewport);
                if (updateDisplayIfNeeded(cm, update)) {
                    updateHeightsInViewport(cm);
                    postUpdateDisplay(cm, update);
                    var barMeasure = measureForScrollbars(cm);
                    updateSelection(cm);
                    updateScrollbars(cm, barMeasure);
                    setDocumentHeight(cm, barMeasure);
                    update.finish();
                }
            }

            // Sync the actual display DOM structure with display.view, removing
            // nodes for lines that are no longer in view, and creating the ones
            // that are not there yet, and updating the ones that are out of
            // date.
            function patchDisplay(cm, updateNumbersFrom, dims) {
                var display = cm.display, lineNumbers = cm.options.lineNumbers;
                var container = display.lineDiv, cur = container.firstChild;

                function rm(node) {
                    var next = node.nextSibling;
                    // Works around a throw-scroll bug in OS X Webkit
                    if (webkit && mac && cm.display.currentWheelTarget == node) {
                        node.style.display = "none";
                    } else {
                        node.parentNode.removeChild(node);
                    }
                    return next
                }

                var view = display.view, lineN = display.viewFrom;
                // Loop over the elements in the view, syncing cur (the DOM nodes
                // in display.lineDiv) with the view as we go.
                for (var i = 0; i < view.length; i++) {
                    var lineView = view[i];
                    if (lineView.hidden) ; else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
                        var node = buildLineElement(cm, lineView, lineN, dims);
                        container.insertBefore(node, cur);
                    } else { // Already drawn
                        while (cur != lineView.node) {
                            cur = rm(cur);
                        }
                        var updateNumber = lineNumbers && updateNumbersFrom != null &&
                            updateNumbersFrom <= lineN && lineView.lineNumber;
                        if (lineView.changes) {
                            if (indexOf(lineView.changes, "gutter") > -1) {
                                updateNumber = false;
                            }
                            updateLineForChanges(cm, lineView, lineN, dims);
                        }
                        if (updateNumber) {
                            removeChildren(lineView.lineNumber);
                            lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
                        }
                        cur = lineView.node.nextSibling;
                    }
                    lineN += lineView.size;
                }
                while (cur) {
                    cur = rm(cur);
                }
            }

            function updateGutterSpace(cm) {
                var width = cm.display.gutters.offsetWidth;
                cm.display.sizer.style.marginLeft = width + "px";
            }

            function setDocumentHeight(cm, measure) {
                cm.display.sizer.style.minHeight = measure.docHeight + "px";
                cm.display.heightForcer.style.top = measure.docHeight + "px";
                cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
            }

            // Rebuild the gutter elements, ensure the margin to the left of the
            // code matches their width.
            function updateGutters(cm) {
                var gutters = cm.display.gutters, specs = cm.options.gutters;
                removeChildren(gutters);
                var i = 0;
                for (; i < specs.length; ++i) {
                    var gutterClass = specs[i];
                    var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
                    if (gutterClass == "CodeMirror-linenumbers") {
                        cm.display.lineGutter = gElt;
                        gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
                    }
                }
                gutters.style.display = i ? "" : "none";
                updateGutterSpace(cm);
            }

            // Make sure the gutters options contains the element
            // "CodeMirror-linenumbers" when the lineNumbers option is true.
            function setGuttersForLineNumbers(options) {
                var found = indexOf(options.gutters, "CodeMirror-linenumbers");
                if (found == -1 && options.lineNumbers) {
                    options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
                } else if (found > -1 && !options.lineNumbers) {
                    options.gutters = options.gutters.slice(0);
                    options.gutters.splice(found, 1);
                }
            }

            // Since the delta values reported on mouse wheel events are
            // unstandardized between browsers and even browser versions, and
            // generally horribly unpredictable, this code starts by measuring
            // the scroll effect that the first few mouse wheel events have,
            // and, from that, detects the way it can convert deltas to pixel
            // offsets afterwards.
            //
            // The reason we want to know the amount a wheel event will scroll
            // is that it gives us a chance to update the display before the
            // actual scrolling happens, reducing flickering.

            var wheelSamples = 0, wheelPixelsPerUnit = null;
            // Fill in a browser-detected starting value on browsers where we
            // know one. These don't have to be accurate -- the result of them
            // being wrong would just be a slight flicker on the first wheel
            // scroll (if it is large enough).
            if (ie) {
                wheelPixelsPerUnit = -.53;
            } else if (gecko) {
                wheelPixelsPerUnit = 15;
            } else if (chrome) {
                wheelPixelsPerUnit = -.7;
            } else if (safari) {
                wheelPixelsPerUnit = -1 / 3;
            }

            function wheelEventDelta(e) {
                var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
                if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) {
                    dx = e.detail;
                }
                if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) {
                    dy = e.detail;
                } else if (dy == null) {
                    dy = e.wheelDelta;
                }
                return {x: dx, y: dy}
            }

            function wheelEventPixels(e) {
                var delta = wheelEventDelta(e);
                delta.x *= wheelPixelsPerUnit;
                delta.y *= wheelPixelsPerUnit;
                return delta
            }

            function onScrollWheel(cm, e) {
                var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;

                var display = cm.display, scroll = display.scroller;
                // Quit if there's nothing to scroll here
                var canScrollX = scroll.scrollWidth > scroll.clientWidth;
                var canScrollY = scroll.scrollHeight > scroll.clientHeight;
                if (!(dx && canScrollX || dy && canScrollY)) {
                    return
                }

                // Webkit browsers on OS X abort momentum scrolls when the target
                // of the scroll event is removed from the scrollable element.
                // This hack (see related code in patchDisplay) makes sure the
                // element is kept around.
                if (dy && mac && webkit) {
                    outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
                        for (var i = 0; i < view.length; i++) {
                            if (view[i].node == cur) {
                                cm.display.currentWheelTarget = cur;
                                break outer
                            }
                        }
                    }
                }

                // On some browsers, horizontal scrolling will cause redraws to
                // happen before the gutter has been realigned, causing it to
                // wriggle around in a most unseemly way. When we have an
                // estimated pixels/delta value, we just handle horizontal
                // scrolling entirely here. It'll be slightly off from native, but
                // better than glitching out.
                if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
                    if (dy && canScrollY) {
                        updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit));
                    }
                    setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit));
                    // Only prevent default scrolling if vertical scrolling is
                    // actually possible. Otherwise, it causes vertical scroll
                    // jitter on OSX trackpads when deltaX is small and deltaY
                    // is large (issue #3579)
                    if (!dy || (dy && canScrollY)) {
                        e_preventDefault(e);
                    }
                    display.wheelStartX = null; // Abort measurement, if in progress
                    return
                }

                // 'Project' the visible viewport to cover the area that is being
                // scrolled into view (if we know enough to estimate it).
                if (dy && wheelPixelsPerUnit != null) {
                    var pixels = dy * wheelPixelsPerUnit;
                    var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
                    if (pixels < 0) {
                        top = Math.max(0, top + pixels - 50);
                    } else {
                        bot = Math.min(cm.doc.height, bot + pixels + 50);
                    }
                    updateDisplaySimple(cm, {top: top, bottom: bot});
                }

                if (wheelSamples < 20) {
                    if (display.wheelStartX == null) {
                        display.wheelStartX = scroll.scrollLeft;
                        display.wheelStartY = scroll.scrollTop;
                        display.wheelDX = dx;
                        display.wheelDY = dy;
                        setTimeout(function () {
                            if (display.wheelStartX == null) {
                                return
                            }
                            var movedX = scroll.scrollLeft - display.wheelStartX;
                            var movedY = scroll.scrollTop - display.wheelStartY;
                            var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
                                (movedX && display.wheelDX && movedX / display.wheelDX);
                            display.wheelStartX = display.wheelStartY = null;
                            if (!sample) {
                                return
                            }
                            wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
                            ++wheelSamples;
                        }, 200);
                    } else {
                        display.wheelDX += dx;
                        display.wheelDY += dy;
                    }
                }
            }

            // Selection objects are immutable. A new one is created every time
            // the selection changes. A selection is one or more non-overlapping
            // (and non-touching) ranges, sorted, and an integer that indicates
            // which one is the primary selection (the one that's scrolled into
            // view, that getCursor returns, etc).
            var Selection = function (ranges, primIndex) {
                this.ranges = ranges;
                this.primIndex = primIndex;
            };

            Selection.prototype.primary = function () {
                return this.ranges[this.primIndex]
            };

            Selection.prototype.equals = function (other) {
                var this$1 = this;

                if (other == this) {
                    return true
                }
                if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) {
                    return false
                }
                for (var i = 0; i < this.ranges.length; i++) {
                    var here = this$1.ranges[i], there = other.ranges[i];
                    if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) {
                        return false
                    }
                }
                return true
            };

            Selection.prototype.deepCopy = function () {
                var this$1 = this;

                var out = [];
                for (var i = 0; i < this.ranges.length; i++) {
                    out[i] = new Range(copyPos(this$1.ranges[i].anchor), copyPos(this$1.ranges[i].head));
                }
                return new Selection(out, this.primIndex)
            };

            Selection.prototype.somethingSelected = function () {
                var this$1 = this;

                for (var i = 0; i < this.ranges.length; i++) {
                    if (!this$1.ranges[i].empty()) {
                        return true
                    }
                }
                return false
            };

            Selection.prototype.contains = function (pos, end) {
                var this$1 = this;

                if (!end) {
                    end = pos;
                }
                for (var i = 0; i < this.ranges.length; i++) {
                    var range = this$1.ranges[i];
                    if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0) {
                        return i
                    }
                }
                return -1
            };

            var Range = function (anchor, head) {
                this.anchor = anchor;
                this.head = head;
            };

            Range.prototype.from = function () {
                return minPos(this.anchor, this.head)
            };
            Range.prototype.to = function () {
                return maxPos(this.anchor, this.head)
            };
            Range.prototype.empty = function () {
                return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch
            };

            // Take an unsorted, potentially overlapping set of ranges, and
            // build a selection out of it. 'Consumes' ranges array (modifying
            // it).
            function normalizeSelection(cm, ranges, primIndex) {
                var mayTouch = cm && cm.options.selectionsMayTouch;
                var prim = ranges[primIndex];
                ranges.sort(function (a, b) {
                    return cmp(a.from(), b.from());
                });
                primIndex = indexOf(ranges, prim);
                for (var i = 1; i < ranges.length; i++) {
                    var cur = ranges[i], prev = ranges[i - 1];
                    var diff = cmp(prev.to(), cur.from());
                    if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {
                        var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
                        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
                        if (i <= primIndex) {
                            --primIndex;
                        }
                        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
                    }
                }
                return new Selection(ranges, primIndex)
            }

            function simpleSelection(anchor, head) {
                return new Selection([new Range(anchor, head || anchor)], 0)
            }

            // Compute the position of the end of a change (its 'to' property
            // refers to the pre-change end).
            function changeEnd(change) {
                if (!change.text) {
                    return change.to
                }
                return Pos(change.from.line + change.text.length - 1,
                    lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
            }

            // Adjust a position to refer to the post-change position of the
            // same text, or the end of the change if the change covers it.
            function adjustForChange(pos, change) {
                if (cmp(pos, change.from) < 0) {
                    return pos
                }
                if (cmp(pos, change.to) <= 0) {
                    return changeEnd(change)
                }

                var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
                if (pos.line == change.to.line) {
                    ch += changeEnd(change).ch - change.to.ch;
                }
                return Pos(line, ch)
            }

            function computeSelAfterChange(doc, change) {
                var out = [];
                for (var i = 0; i < doc.sel.ranges.length; i++) {
                    var range = doc.sel.ranges[i];
                    out.push(new Range(adjustForChange(range.anchor, change),
                        adjustForChange(range.head, change)));
                }
                return normalizeSelection(doc.cm, out, doc.sel.primIndex)
            }

            function offsetPos(pos, old, nw) {
                if (pos.line == old.line) {
                    return Pos(nw.line, pos.ch - old.ch + nw.ch)
                } else {
                    return Pos(nw.line + (pos.line - old.line), pos.ch)
                }
            }

            // Used by replaceSelections to allow moving the selection to the
            // start or around the replaced test. Hint may be "start" or "around".
            function computeReplacedSel(doc, changes, hint) {
                var out = [];
                var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
                for (var i = 0; i < changes.length; i++) {
                    var change = changes[i];
                    var from = offsetPos(change.from, oldPrev, newPrev);
                    var to = offsetPos(changeEnd(change), oldPrev, newPrev);
                    oldPrev = change.to;
                    newPrev = to;
                    if (hint == "around") {
                        var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
                        out[i] = new Range(inv ? to : from, inv ? from : to);
                    } else {
                        out[i] = new Range(from, from);
                    }
                }
                return new Selection(out, doc.sel.primIndex)
            }

            // Used to get the editor into a consistent state again when options change.

            function loadMode(cm) {
                cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
                resetModeState(cm);
            }

            function resetModeState(cm) {
                cm.doc.iter(function (line) {
                    if (line.stateAfter) {
                        line.stateAfter = null;
                    }
                    if (line.styles) {
                        line.styles = null;
                    }
                });
                cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
                startWorker(cm, 100);
                cm.state.modeGen++;
                if (cm.curOp) {
                    regChange(cm);
                }
            }

            // DOCUMENT DATA STRUCTURE

            // By default, updates that start and end at the beginning of a line
            // are treated specially, in order to make the association of line
            // widgets and marker elements with the text behave more intuitive.
            function isWholeLineUpdate(doc, change) {
                return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
                    (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
            }

            // Perform a change on the document data structure.
            function updateDoc(doc, change, markedSpans, estimateHeight$$1) {
                function spansFor(n) {
                    return markedSpans ? markedSpans[n] : null
                }

                function update(line, text, spans) {
                    updateLine(line, text, spans, estimateHeight$$1);
                    signalLater(line, "change", line, change);
                }

                function linesFor(start, end) {
                    var result = [];
                    for (var i = start; i < end; ++i) {
                        result.push(new Line(text[i], spansFor(i), estimateHeight$$1));
                    }
                    return result
                }

                var from = change.from, to = change.to, text = change.text;
                var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
                var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;

                // Adjust the line structure
                if (change.full) {
                    doc.insert(0, linesFor(0, text.length));
                    doc.remove(text.length, doc.size - text.length);
                } else if (isWholeLineUpdate(doc, change)) {
                    // This is a whole-line replace. Treated specially to make
                    // sure line objects move the way they are supposed to.
                    var added = linesFor(0, text.length - 1);
                    update(lastLine, lastLine.text, lastSpans);
                    if (nlines) {
                        doc.remove(from.line, nlines);
                    }
                    if (added.length) {
                        doc.insert(from.line, added);
                    }
                } else if (firstLine == lastLine) {
                    if (text.length == 1) {
                        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
                    } else {
                        var added$1 = linesFor(1, text.length - 1);
                        added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight$$1));
                        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
                        doc.insert(from.line + 1, added$1);
                    }
                } else if (text.length == 1) {
                    update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
                    doc.remove(from.line + 1, nlines);
                } else {
                    update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
                    update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
                    var added$2 = linesFor(1, text.length - 1);
                    if (nlines > 1) {
                        doc.remove(from.line + 1, nlines - 1);
                    }
                    doc.insert(from.line + 1, added$2);
                }

                signalLater(doc, "change", doc, change);
            }

            // Call f for all linked documents.
            function linkedDocs(doc, f, sharedHistOnly) {
                function propagate(doc, skip, sharedHist) {
                    if (doc.linked) {
                        for (var i = 0; i < doc.linked.length; ++i) {
                            var rel = doc.linked[i];
                            if (rel.doc == skip) {
                                continue
                            }
                            var shared = sharedHist && rel.sharedHist;
                            if (sharedHistOnly && !shared) {
                                continue
                            }
                            f(rel.doc, shared);
                            propagate(rel.doc, doc, shared);
                        }
                    }
                }

                propagate(doc, null, true);
            }

            // Attach a document to an editor.
            function attachDoc(cm, doc) {
                if (doc.cm) {
                    throw new Error("This document is already in use.")
                }
                cm.doc = doc;
                doc.cm = cm;
                estimateLineHeights(cm);
                loadMode(cm);
                setDirectionClass(cm);
                if (!cm.options.lineWrapping) {
                    findMaxLine(cm);
                }
                cm.options.mode = doc.modeOption;
                regChange(cm);
            }

            function setDirectionClass(cm) {
                (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
            }

            function directionChanged(cm) {
                runInOp(cm, function () {
                    setDirectionClass(cm);
                    regChange(cm);
                });
            }

            function History(startGen) {
                // Arrays of change events and selections. Doing something adds an
                // event to done and clears undo. Undoing moves events from done
                // to undone, redoing moves them in the other direction.
                this.done = [];
                this.undone = [];
                this.undoDepth = Infinity;
                // Used to track when changes can be merged into a single undo
                // event
                this.lastModTime = this.lastSelTime = 0;
                this.lastOp = this.lastSelOp = null;
                this.lastOrigin = this.lastSelOrigin = null;
                // Used by the isClean() method
                this.generation = this.maxGeneration = startGen || 1;
            }

            // Create a history change event from an updateDoc-style change
            // object.
            function historyChangeFromChange(doc, change) {
                var histChange = {
                    from: copyPos(change.from),
                    to: changeEnd(change),
                    text: getBetween(doc, change.from, change.to)
                };
                attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
                linkedDocs(doc, function (doc) {
                    return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
                }, true);
                return histChange
            }

            // Pop all selection events off the end of a history array. Stop at
            // a change event.
            function clearSelectionEvents(array) {
                while (array.length) {
                    var last = lst(array);
                    if (last.ranges) {
                        array.pop();
                    } else {
                        break
                    }
                }
            }

            // Find the top change event in the history. Pop off selection
            // events that are in the way.
            function lastChangeEvent(hist, force) {
                if (force) {
                    clearSelectionEvents(hist.done);
                    return lst(hist.done)
                } else if (hist.done.length && !lst(hist.done).ranges) {
                    return lst(hist.done)
                } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
                    hist.done.pop();
                    return lst(hist.done)
                }
            }

            // Register a change in the history. Merges changes that are within
            // a single operation, or are close together with an origin that
            // allows merging (starting with "+") into a single event.
            function addChangeToHistory(doc, change, selAfter, opId) {
                var hist = doc.history;
                hist.undone.length = 0;
                var time = +new Date, cur;
                var last;

                if ((hist.lastOp == opId ||
                    hist.lastOrigin == change.origin && change.origin &&
                    ((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
                        change.origin.charAt(0) == "*")) &&
                    (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
                    // Merge this change into the last event
                    last = lst(cur.changes);
                    if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
                        // Optimized case for simple insertion -- don't want to add
                        // new changesets for every character typed
                        last.to = changeEnd(change);
                    } else {
                        // Add new sub-event
                        cur.changes.push(historyChangeFromChange(doc, change));
                    }
                } else {
                    // Can not be merged, start a new event.
                    var before = lst(hist.done);
                    if (!before || !before.ranges) {
                        pushSelectionToHistory(doc.sel, hist.done);
                    }
                    cur = {
                        changes: [historyChangeFromChange(doc, change)],
                        generation: hist.generation
                    };
                    hist.done.push(cur);
                    while (hist.done.length > hist.undoDepth) {
                        hist.done.shift();
                        if (!hist.done[0].ranges) {
                            hist.done.shift();
                        }
                    }
                }
                hist.done.push(selAfter);
                hist.generation = ++hist.maxGeneration;
                hist.lastModTime = hist.lastSelTime = time;
                hist.lastOp = hist.lastSelOp = opId;
                hist.lastOrigin = hist.lastSelOrigin = change.origin;

                if (!last) {
                    signal(doc, "historyAdded");
                }
            }

            function selectionEventCanBeMerged(doc, origin, prev, sel) {
                var ch = origin.charAt(0);
                return ch == "*" ||
                    ch == "+" &&
                    prev.ranges.length == sel.ranges.length &&
                    prev.somethingSelected() == sel.somethingSelected() &&
                    new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
            }

            // Called whenever the selection changes, sets the new selection as
            // the pending selection in the history, and pushes the old pending
            // selection into the 'done' array when it was significantly
            // different (in number of selected ranges, emptiness, or time).
            function addSelectionToHistory(doc, sel, opId, options) {
                var hist = doc.history, origin = options && options.origin;

                // A new event is started when the previous origin does not match
                // the current, or the origins don't allow matching. Origins
                // starting with * are always merged, those starting with + are
                // merged when similar and close together in time.
                if (opId == hist.lastSelOp ||
                    (origin && hist.lastSelOrigin == origin &&
                        (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
                            selectionEventCanBeMerged(doc, origin, lst(hist.done), sel)))) {
                    hist.done[hist.done.length - 1] = sel;
                } else {
                    pushSelectionToHistory(sel, hist.done);
                }

                hist.lastSelTime = +new Date;
                hist.lastSelOrigin = origin;
                hist.lastSelOp = opId;
                if (options && options.clearRedo !== false) {
                    clearSelectionEvents(hist.undone);
                }
            }

            function pushSelectionToHistory(sel, dest) {
                var top = lst(dest);
                if (!(top && top.ranges && top.equals(sel))) {
                    dest.push(sel);
                }
            }

            // Used to store marked span information in the history.
            function attachLocalSpans(doc, change, from, to) {
                var existing = change["spans_" + doc.id], n = 0;
                doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
                    if (line.markedSpans) {
                        (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;
                    }
                    ++n;
                });
            }

            // When un/re-doing restores text containing marked spans, those
            // that have been explicitly cleared should not be restored.
            function removeClearedSpans(spans) {
                if (!spans) {
                    return null
                }
                var out;
                for (var i = 0; i < spans.length; ++i) {
                    if (spans[i].marker.explicitlyCleared) {
                        if (!out) {
                            out = spans.slice(0, i);
                        }
                    } else if (out) {
                        out.push(spans[i]);
                    }
                }
                return !out ? spans : out.length ? out : null
            }

            // Retrieve and filter the old marked spans stored in a change event.
            function getOldSpans(doc, change) {
                var found = change["spans_" + doc.id];
                if (!found) {
                    return null
                }
                var nw = [];
                for (var i = 0; i < change.text.length; ++i) {
                    nw.push(removeClearedSpans(found[i]));
                }
                return nw
            }

            // Used for un/re-doing changes from the history. Combines the
            // result of computing the existing spans with the set of spans that
            // existed in the history (so that deleting around a span and then
            // undoing brings back the span).
            function mergeOldSpans(doc, change) {
                var old = getOldSpans(doc, change);
                var stretched = stretchSpansOverChange(doc, change);
                if (!old) {
                    return stretched
                }
                if (!stretched) {
                    return old
                }

                for (var i = 0; i < old.length; ++i) {
                    var oldCur = old[i], stretchCur = stretched[i];
                    if (oldCur && stretchCur) {
                        spans: for (var j = 0; j < stretchCur.length; ++j) {
                            var span = stretchCur[j];
                            for (var k = 0; k < oldCur.length; ++k) {
                                if (oldCur[k].marker == span.marker) {
                                    continue spans
                                }
                            }
                            oldCur.push(span);
                        }
                    } else if (stretchCur) {
                        old[i] = stretchCur;
                    }
                }
                return old
            }

            // Used both to provide a JSON-safe object in .getHistory, and, when
            // detaching a document, to split the history in two
            function copyHistoryArray(events, newGroup, instantiateSel) {
                var copy = [];
                for (var i = 0; i < events.length; ++i) {
                    var event = events[i];
                    if (event.ranges) {
                        copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
                        continue
                    }
                    var changes = event.changes, newChanges = [];
                    copy.push({changes: newChanges});
                    for (var j = 0; j < changes.length; ++j) {
                        var change = changes[j], m = (void 0);
                        newChanges.push({from: change.from, to: change.to, text: change.text});
                        if (newGroup) {
                            for (var prop in change) {
                                if (m = prop.match(/^spans_(\d+)$/)) {
                                    if (indexOf(newGroup, Number(m[1])) > -1) {
                                        lst(newChanges)[prop] = change[prop];
                                        delete change[prop];
                                    }
                                }
                            }
                        }
                    }
                }
                return copy
            }

            // The 'scroll' parameter given to many of these indicated whether
            // the new cursor position should be scrolled into view after
            // modifying the selection.

            // If shift is held or the extend flag is set, extends a range to
            // include a given position (and optionally a second position).
            // Otherwise, simply returns the range between the given positions.
            // Used for cursor motion and such.
            function extendRange(range, head, other, extend) {
                if (extend) {
                    var anchor = range.anchor;
                    if (other) {
                        var posBefore = cmp(head, anchor) < 0;
                        if (posBefore != (cmp(other, anchor) < 0)) {
                            anchor = head;
                            head = other;
                        } else if (posBefore != (cmp(head, other) < 0)) {
                            head = other;
                        }
                    }
                    return new Range(anchor, head)
                } else {
                    return new Range(other || head, head)
                }
            }

            // Extend the primary selection range, discard the rest.
            function extendSelection(doc, head, other, options, extend) {
                if (extend == null) {
                    extend = doc.cm && (doc.cm.display.shift || doc.extend);
                }
                setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
            }

            // Extend all selections (pos is an array of selections with length
            // equal the number of selections)
            function extendSelections(doc, heads, options) {
                var out = [];
                var extend = doc.cm && (doc.cm.display.shift || doc.extend);
                for (var i = 0; i < doc.sel.ranges.length; i++) {
                    out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend);
                }
                var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);
                setSelection(doc, newSel, options);
            }

            // Updates a single range in the selection.
            function replaceOneSelection(doc, i, range, options) {
                var ranges = doc.sel.ranges.slice(0);
                ranges[i] = range;
                setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options);
            }

            // Reset the selection to a single range.
            function setSimpleSelection(doc, anchor, head, options) {
                setSelection(doc, simpleSelection(anchor, head), options);
            }

            // Give beforeSelectionChange handlers a change to influence a
            // selection update.
            function filterSelectionChange(doc, sel, options) {
                var obj = {
                    ranges: sel.ranges,
                    update: function (ranges) {
                        var this$1 = this;

                        this.ranges = [];
                        for (var i = 0; i < ranges.length; i++) {
                            this$1.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
                                clipPos(doc, ranges[i].head));
                        }
                    },
                    origin: options && options.origin
                };
                signal(doc, "beforeSelectionChange", doc, obj);
                if (doc.cm) {
                    signal(doc.cm, "beforeSelectionChange", doc.cm, obj);
                }
                if (obj.ranges != sel.ranges) {
                    return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1)
                } else {
                    return sel
                }
            }

            function setSelectionReplaceHistory(doc, sel, options) {
                var done = doc.history.done, last = lst(done);
                if (last && last.ranges) {
                    done[done.length - 1] = sel;
                    setSelectionNoUndo(doc, sel, options);
                } else {
                    setSelection(doc, sel, options);
                }
            }

            // Set a new selection.
            function setSelection(doc, sel, options) {
                setSelectionNoUndo(doc, sel, options);
                addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
            }

            function setSelectionNoUndo(doc, sel, options) {
                if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {
                    sel = filterSelectionChange(doc, sel, options);
                }

                var bias = options && options.bias ||
                    (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
                setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

                if (!(options && options.scroll === false) && doc.cm) {
                    ensureCursorVisible(doc.cm);
                }
            }

            function setSelectionInner(doc, sel) {
                if (sel.equals(doc.sel)) {
                    return
                }

                doc.sel = sel;

                if (doc.cm) {
                    doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
                    signalCursorActivity(doc.cm);
                }
                signalLater(doc, "cursorActivity", doc);
            }

            // Verify that the selection does not partially select any atomic
            // marked ranges.
            function reCheckSelection(doc) {
                setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
            }

            // Return a selection that does not partially select any atomic
            // ranges.
            function skipAtomicInSelection(doc, sel, bias, mayClear) {
                var out;
                for (var i = 0; i < sel.ranges.length; i++) {
                    var range = sel.ranges[i];
                    var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
                    var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
                    var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
                    if (out || newAnchor != range.anchor || newHead != range.head) {
                        if (!out) {
                            out = sel.ranges.slice(0, i);
                        }
                        out[i] = new Range(newAnchor, newHead);
                    }
                }
                return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel
            }

            function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
                var line = getLine(doc, pos.line);
                if (line.markedSpans) {
                    for (var i = 0; i < line.markedSpans.length; ++i) {
                        var sp = line.markedSpans[i], m = sp.marker;
                        if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
                            (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
                            if (mayClear) {
                                signal(m, "beforeCursorEnter");
                                if (m.explicitlyCleared) {
                                    if (!line.markedSpans) {
                                        break
                                    } else {
                                        --i;
                                        continue
                                    }
                                }
                            }
                            if (!m.atomic) {
                                continue
                            }

                            if (oldPos) {
                                var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);
                                if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft) {
                                    near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null);
                                }
                                if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0)) {
                                    return skipAtomicInner(doc, near, pos, dir, mayClear)
                                }
                            }

                            var far = m.find(dir < 0 ? -1 : 1);
                            if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight) {
                                far = movePos(doc, far, dir, far.line == pos.line ? line : null);
                            }
                            return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
                        }
                    }
                }
                return pos
            }

            // Ensure a given position is not inside an atomic range.
            function skipAtomic(doc, pos, oldPos, bias, mayClear) {
                var dir = bias || 1;
                var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
                    (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
                    skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
                    (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
                if (!found) {
                    doc.cantEdit = true;
                    return Pos(doc.first, 0)
                }
                return found
            }

            function movePos(doc, pos, dir, line) {
                if (dir < 0 && pos.ch == 0) {
                    if (pos.line > doc.first) {
                        return clipPos(doc, Pos(pos.line - 1))
                    } else {
                        return null
                    }
                } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
                    if (pos.line < doc.first + doc.size - 1) {
                        return Pos(pos.line + 1, 0)
                    } else {
                        return null
                    }
                } else {
                    return new Pos(pos.line, pos.ch + dir)
                }
            }

            function selectAll(cm) {
                cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
            }

            // UPDATING

            // Allow "beforeChange" event handlers to influence a change
            function filterChange(doc, change, update) {
                var obj = {
                    canceled: false,
                    from: change.from,
                    to: change.to,
                    text: change.text,
                    origin: change.origin,
                    cancel: function () {
                        return obj.canceled = true;
                    }
                };
                if (update) {
                    obj.update = function (from, to, text, origin) {
                        if (from) {
                            obj.from = clipPos(doc, from);
                        }
                        if (to) {
                            obj.to = clipPos(doc, to);
                        }
                        if (text) {
                            obj.text = text;
                        }
                        if (origin !== undefined) {
                            obj.origin = origin;
                        }
                    };
                }
                signal(doc, "beforeChange", doc, obj);
                if (doc.cm) {
                    signal(doc.cm, "beforeChange", doc.cm, obj);
                }

                if (obj.canceled) {
                    return null
                }
                return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
            }

            // Apply a change to a document, and add it to the document's
            // history, and propagating it to all linked documents.
            function makeChange(doc, change, ignoreReadOnly) {
                if (doc.cm) {
                    if (!doc.cm.curOp) {
                        return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly)
                    }
                    if (doc.cm.state.suppressEdits) {
                        return
                    }
                }

                if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
                    change = filterChange(doc, change, true);
                    if (!change) {
                        return
                    }
                }

                // Possibly split or suppress the update based on the presence
                // of read-only spans in its range.
                var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
                if (split) {
                    for (var i = split.length - 1; i >= 0; --i) {
                        makeChangeInner(doc, {
                            from: split[i].from,
                            to: split[i].to,
                            text: i ? [""] : change.text,
                            origin: change.origin
                        });
                    }
                } else {
                    makeChangeInner(doc, change);
                }
            }

            function makeChangeInner(doc, change) {
                if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) {
                    return
                }
                var selAfter = computeSelAfterChange(doc, change);
                addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);

                makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
                var rebased = [];

                linkedDocs(doc, function (doc, sharedHist) {
                    if (!sharedHist && indexOf(rebased, doc.history) == -1) {
                        rebaseHist(doc.history, change);
                        rebased.push(doc.history);
                    }
                    makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
                });
            }

            // Revert a change stored in a document's history.
            function makeChangeFromHistory(doc, type, allowSelectionOnly) {
                var suppress = doc.cm && doc.cm.state.suppressEdits;
                if (suppress && !allowSelectionOnly) {
                    return
                }

                var hist = doc.history, event, selAfter = doc.sel;
                var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;

                // Verify that there is a useable event (so that ctrl-z won't
                // needlessly clear selection events)
                var i = 0;
                for (; i < source.length; i++) {
                    event = source[i];
                    if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges) {
                        break
                    }
                }
                if (i == source.length) {
                    return
                }
                hist.lastOrigin = hist.lastSelOrigin = null;

                for (; ;) {
                    event = source.pop();
                    if (event.ranges) {
                        pushSelectionToHistory(event, dest);
                        if (allowSelectionOnly && !event.equals(doc.sel)) {
                            setSelection(doc, event, {clearRedo: false});
                            return
                        }
                        selAfter = event;
                    } else if (suppress) {
                        source.push(event);
                        return
                    } else {
                        break
                    }
                }

                // Build up a reverse change object to add to the opposite history
                // stack (redo when undoing, and vice versa).
                var antiChanges = [];
                pushSelectionToHistory(selAfter, dest);
                dest.push({changes: antiChanges, generation: hist.generation});
                hist.generation = event.generation || ++hist.maxGeneration;

                var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");

                var loop = function (i) {
                    var change = event.changes[i];
                    change.origin = type;
                    if (filter && !filterChange(doc, change, false)) {
                        source.length = 0;
                        return {}
                    }

                    antiChanges.push(historyChangeFromChange(doc, change));

                    var after = i ? computeSelAfterChange(doc, change) : lst(source);
                    makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
                    if (!i && doc.cm) {
                        doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)});
                    }
                    var rebased = [];

                    // Propagate to the linked documents
                    linkedDocs(doc, function (doc, sharedHist) {
                        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
                            rebaseHist(doc.history, change);
                            rebased.push(doc.history);
                        }
                        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
                    });
                };

                for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
                    var returned = loop(i$1);

                    if (returned) return returned.v;
                }
            }

            // Sub-views need their line numbers shifted when text is added
            // above or below them in the parent document.
            function shiftDoc(doc, distance) {
                if (distance == 0) {
                    return
                }
                doc.first += distance;
                doc.sel = new Selection(map(doc.sel.ranges, function (range) {
                    return new Range(
                        Pos(range.anchor.line + distance, range.anchor.ch),
                        Pos(range.head.line + distance, range.head.ch)
                    );
                }), doc.sel.primIndex);
                if (doc.cm) {
                    regChange(doc.cm, doc.first, doc.first - distance, distance);
                    for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++) {
                        regLineChange(doc.cm, l, "gutter");
                    }
                }
            }

            // More lower-level change function, handling only a single document
            // (not linked ones).
            function makeChangeSingleDoc(doc, change, selAfter, spans) {
                if (doc.cm && !doc.cm.curOp) {
                    return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans)
                }

                if (change.to.line < doc.first) {
                    shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
                    return
                }
                if (change.from.line > doc.lastLine()) {
                    return
                }

                // Clip the change to the size of this doc
                if (change.from.line < doc.first) {
                    var shift = change.text.length - 1 - (doc.first - change.from.line);
                    shiftDoc(doc, shift);
                    change = {
                        from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
                        text: [lst(change.text)], origin: change.origin
                    };
                }
                var last = doc.lastLine();
                if (change.to.line > last) {
                    change = {
                        from: change.from, to: Pos(last, getLine(doc, last).text.length),
                        text: [change.text[0]], origin: change.origin
                    };
                }

                change.removed = getBetween(doc, change.from, change.to);

                if (!selAfter) {
                    selAfter = computeSelAfterChange(doc, change);
                }
                if (doc.cm) {
                    makeChangeSingleDocInEditor(doc.cm, change, spans);
                } else {
                    updateDoc(doc, change, spans);
                }
                setSelectionNoUndo(doc, selAfter, sel_dontScroll);
            }

            // Handle the interaction of a change to a document with the editor
            // that this document is part of.
            function makeChangeSingleDocInEditor(cm, change, spans) {
                var doc = cm.doc, display = cm.display, from = change.from, to = change.to;

                var recomputeMaxLength = false, checkWidthStart = from.line;
                if (!cm.options.lineWrapping) {
                    checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
                    doc.iter(checkWidthStart, to.line + 1, function (line) {
                        if (line == display.maxLine) {
                            recomputeMaxLength = true;
                            return true
                        }
                    });
                }

                if (doc.sel.contains(change.from, change.to) > -1) {
                    signalCursorActivity(cm);
                }

                updateDoc(doc, change, spans, estimateHeight(cm));

                if (!cm.options.lineWrapping) {
                    doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
                        var len = lineLength(line);
                        if (len > display.maxLineLength) {
                            display.maxLine = line;
                            display.maxLineLength = len;
                            display.maxLineChanged = true;
                            recomputeMaxLength = false;
                        }
                    });
                    if (recomputeMaxLength) {
                        cm.curOp.updateMaxLine = true;
                    }
                }

                retreatFrontier(doc, from.line);
                startWorker(cm, 400);

                var lendiff = change.text.length - (to.line - from.line) - 1;
                // Remember that these lines changed, for updating the display
                if (change.full) {
                    regChange(cm);
                } else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change)) {
                    regLineChange(cm, from.line, "text");
                } else {
                    regChange(cm, from.line, to.line + 1, lendiff);
                }

                var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
                if (changeHandler || changesHandler) {
                    var obj = {
                        from: from, to: to,
                        text: change.text,
                        removed: change.removed,
                        origin: change.origin
                    };
                    if (changeHandler) {
                        signalLater(cm, "change", cm, obj);
                    }
                    if (changesHandler) {
                        (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj);
                    }
                }
                cm.display.selForContextMenu = null;
            }

            function replaceRange(doc, code, from, to, origin) {
                var assign;

                if (!to) {
                    to = from;
                }
                if (cmp(to, from) < 0) {
                    (assign = [to, from], from = assign[0], to = assign[1]);
                }
                if (typeof code == "string") {
                    code = doc.splitLines(code);
                }
                makeChange(doc, {from: from, to: to, text: code, origin: origin});
            }

            // Rebasing/resetting history to deal with externally-sourced changes

            function rebaseHistSelSingle(pos, from, to, diff) {
                if (to < pos.line) {
                    pos.line += diff;
                } else if (from < pos.line) {
                    pos.line = from;
                    pos.ch = 0;
                }
            }

            // Tries to rebase an array of history events given a change in the
            // document. If the change touches the same lines as the event, the
            // event, and everything 'behind' it, is discarded. If the change is
            // before the event, the event's positions are updated. Uses a
            // copy-on-write scheme for the positions, to avoid having to
            // reallocate them all on every rebase, but also avoid problems with
            // shared position objects being unsafely updated.
            function rebaseHistArray(array, from, to, diff) {
                for (var i = 0; i < array.length; ++i) {
                    var sub = array[i], ok = true;
                    if (sub.ranges) {
                        if (!sub.copied) {
                            sub = array[i] = sub.deepCopy();
                            sub.copied = true;
                        }
                        for (var j = 0; j < sub.ranges.length; j++) {
                            rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
                            rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
                        }
                        continue
                    }
                    for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
                        var cur = sub.changes[j$1];
                        if (to < cur.from.line) {
                            cur.from = Pos(cur.from.line + diff, cur.from.ch);
                            cur.to = Pos(cur.to.line + diff, cur.to.ch);
                        } else if (from <= cur.to.line) {
                            ok = false;
                            break
                        }
                    }
                    if (!ok) {
                        array.splice(0, i + 1);
                        i = 0;
                    }
                }
            }

            function rebaseHist(hist, change) {
                var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
                rebaseHistArray(hist.done, from, to, diff);
                rebaseHistArray(hist.undone, from, to, diff);
            }

            // Utility for applying a change to a line by handle or number,
            // returning the number and optionally registering the line as
            // changed.
            function changeLine(doc, handle, changeType, op) {
                var no = handle, line = handle;
                if (typeof handle == "number") {
                    line = getLine(doc, clipLine(doc, handle));
                } else {
                    no = lineNo(handle);
                }
                if (no == null) {
                    return null
                }
                if (op(line, no) && doc.cm) {
                    regLineChange(doc.cm, no, changeType);
                }
                return line
            }

            // The document is represented as a BTree consisting of leaves, with
            // chunk of lines in them, and branches, with up to ten leaves or
            // other branch nodes below them. The top node is always a branch
            // node, and is the document object itself (meaning it has
            // additional methods and properties).
            //
            // All nodes have parent links. The tree is used both to go from
            // line numbers to line objects, and to go from objects to numbers.
            // It also indexes by height, and is used to convert between height
            // and line object, and to find the total height of the document.
            //
            // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

            function LeafChunk(lines) {
                var this$1 = this;

                this.lines = lines;
                this.parent = null;
                var height = 0;
                for (var i = 0; i < lines.length; ++i) {
                    lines[i].parent = this$1;
                    height += lines[i].height;
                }
                this.height = height;
            }

            LeafChunk.prototype = {
                chunkSize: function () {
                    return this.lines.length
                },

                // Remove the n lines at offset 'at'.
                removeInner: function (at, n) {
                    var this$1 = this;

                    for (var i = at, e = at + n; i < e; ++i) {
                        var line = this$1.lines[i];
                        this$1.height -= line.height;
                        cleanUpLine(line);
                        signalLater(line, "delete");
                    }
                    this.lines.splice(at, n);
                },

                // Helper used to collapse a small branch into a single leaf.
                collapse: function (lines) {
                    lines.push.apply(lines, this.lines);
                },

                // Insert the given array of lines at offset 'at', count them as
                // having the given height.
                insertInner: function (at, lines, height) {
                    var this$1 = this;

                    this.height += height;
                    this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
                    for (var i = 0; i < lines.length; ++i) {
                        lines[i].parent = this$1;
                    }
                },

                // Used to iterate over a part of the tree.
                iterN: function (at, n, op) {
                    var this$1 = this;

                    for (var e = at + n; at < e; ++at) {
                        if (op(this$1.lines[at])) {
                            return true
                        }
                    }
                }
            };

            function BranchChunk(children) {
                var this$1 = this;

                this.children = children;
                var size = 0, height = 0;
                for (var i = 0; i < children.length; ++i) {
                    var ch = children[i];
                    size += ch.chunkSize();
                    height += ch.height;
                    ch.parent = this$1;
                }
                this.size = size;
                this.height = height;
                this.parent = null;
            }

            BranchChunk.prototype = {
                chunkSize: function () {
                    return this.size
                },

                removeInner: function (at, n) {
                    var this$1 = this;

                    this.size -= n;
                    for (var i = 0; i < this.children.length; ++i) {
                        var child = this$1.children[i], sz = child.chunkSize();
                        if (at < sz) {
                            var rm = Math.min(n, sz - at), oldHeight = child.height;
                            child.removeInner(at, rm);
                            this$1.height -= oldHeight - child.height;
                            if (sz == rm) {
                                this$1.children.splice(i--, 1);
                                child.parent = null;
                            }
                            if ((n -= rm) == 0) {
                                break
                            }
                            at = 0;
                        } else {
                            at -= sz;
                        }
                    }
                    // If the result is smaller than 25 lines, ensure that it is a
                    // single leaf node.
                    if (this.size - n < 25 &&
                        (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
                        var lines = [];
                        this.collapse(lines);
                        this.children = [new LeafChunk(lines)];
                        this.children[0].parent = this;
                    }
                },

                collapse: function (lines) {
                    var this$1 = this;

                    for (var i = 0; i < this.children.length; ++i) {
                        this$1.children[i].collapse(lines);
                    }
                },

                insertInner: function (at, lines, height) {
                    var this$1 = this;

                    this.size += lines.length;
                    this.height += height;
                    for (var i = 0; i < this.children.length; ++i) {
                        var child = this$1.children[i], sz = child.chunkSize();
                        if (at <= sz) {
                            child.insertInner(at, lines, height);
                            if (child.lines && child.lines.length > 50) {
                                // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
                                // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
                                var remaining = child.lines.length % 25 + 25;
                                for (var pos = remaining; pos < child.lines.length;) {
                                    var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
                                    child.height -= leaf.height;
                                    this$1.children.splice(++i, 0, leaf);
                                    leaf.parent = this$1;
                                }
                                child.lines = child.lines.slice(0, remaining);
                                this$1.maybeSpill();
                            }
                            break
                        }
                        at -= sz;
                    }
                },

                // When a node has grown, check whether it should be split.
                maybeSpill: function () {
                    if (this.children.length <= 10) {
                        return
                    }
                    var me = this;
                    do {
                        var spilled = me.children.splice(me.children.length - 5, 5);
                        var sibling = new BranchChunk(spilled);
                        if (!me.parent) { // Become the parent node
                            var copy = new BranchChunk(me.children);
                            copy.parent = me;
                            me.children = [copy, sibling];
                            me = copy;
                        } else {
                            me.size -= sibling.size;
                            me.height -= sibling.height;
                            var myIndex = indexOf(me.parent.children, me);
                            me.parent.children.splice(myIndex + 1, 0, sibling);
                        }
                        sibling.parent = me.parent;
                    } while (me.children.length > 10)
                    me.parent.maybeSpill();
                },

                iterN: function (at, n, op) {
                    var this$1 = this;

                    for (var i = 0; i < this.children.length; ++i) {
                        var child = this$1.children[i], sz = child.chunkSize();
                        if (at < sz) {
                            var used = Math.min(n, sz - at);
                            if (child.iterN(at, used, op)) {
                                return true
                            }
                            if ((n -= used) == 0) {
                                break
                            }
                            at = 0;
                        } else {
                            at -= sz;
                        }
                    }
                }
            };

            // Line widgets are block elements displayed above or below a line.

            var LineWidget = function (doc, node, options) {
                var this$1 = this;

                if (options) {
                    for (var opt in options) {
                        if (options.hasOwnProperty(opt)) {
                            this$1[opt] = options[opt];
                        }
                    }
                }
                this.doc = doc;
                this.node = node;
            };

            LineWidget.prototype.clear = function () {
                var this$1 = this;

                var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
                if (no == null || !ws) {
                    return
                }
                for (var i = 0; i < ws.length; ++i) {
                    if (ws[i] == this$1) {
                        ws.splice(i--, 1);
                    }
                }
                if (!ws.length) {
                    line.widgets = null;
                }
                var height = widgetHeight(this);
                updateLineHeight(line, Math.max(0, line.height - height));
                if (cm) {
                    runInOp(cm, function () {
                        adjustScrollWhenAboveVisible(cm, line, -height);
                        regLineChange(cm, no, "widget");
                    });
                    signalLater(cm, "lineWidgetCleared", cm, this, no);
                }
            };

            LineWidget.prototype.changed = function () {
                var this$1 = this;

                var oldH = this.height, cm = this.doc.cm, line = this.line;
                this.height = null;
                var diff = widgetHeight(this) - oldH;
                if (!diff) {
                    return
                }
                if (!lineIsHidden(this.doc, line)) {
                    updateLineHeight(line, line.height + diff);
                }
                if (cm) {
                    runInOp(cm, function () {
                        cm.curOp.forceUpdate = true;
                        adjustScrollWhenAboveVisible(cm, line, diff);
                        signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
                    });
                }
            };
            eventMixin(LineWidget);

            function adjustScrollWhenAboveVisible(cm, line, diff) {
                if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop)) {
                    addToScrollTop(cm, diff);
                }
            }

            function addLineWidget(doc, handle, node, options) {
                var widget = new LineWidget(doc, node, options);
                var cm = doc.cm;
                if (cm && widget.noHScroll) {
                    cm.display.alignWidgets = true;
                }
                changeLine(doc, handle, "widget", function (line) {
                    var widgets = line.widgets || (line.widgets = []);
                    if (widget.insertAt == null) {
                        widgets.push(widget);
                    } else {
                        widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);
                    }
                    widget.line = line;
                    if (cm && !lineIsHidden(doc, line)) {
                        var aboveVisible = heightAtLine(line) < doc.scrollTop;
                        updateLineHeight(line, line.height + widgetHeight(widget));
                        if (aboveVisible) {
                            addToScrollTop(cm, widget.height);
                        }
                        cm.curOp.forceUpdate = true;
                    }
                    return true
                });
                if (cm) {
                    signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle));
                }
                return widget
            }

            // TEXTMARKERS

            // Created with markText and setBookmark methods. A TextMarker is a
            // handle that can be used to clear or find a marked position in the
            // document. Line objects hold arrays (markedSpans) containing
            // {from, to, marker} object pointing to such marker objects, and
            // indicating that such a marker is present on that line. Multiple
            // lines may point to the same marker when it spans across lines.
            // The spans will have null for their from/to properties when the
            // marker continues beyond the start/end of the line. Markers have
            // links back to the lines they currently touch.

            // Collapsed markers have unique ids, in order to be able to order
            // them, which is needed for uniquely determining an outer marker
            // when they overlap (they may nest, but not partially overlap).
            var nextMarkerId = 0;

            var TextMarker = function (doc, type) {
                this.lines = [];
                this.type = type;
                this.doc = doc;
                this.id = ++nextMarkerId;
            };

            // Clear the marker.
            TextMarker.prototype.clear = function () {
                var this$1 = this;

                if (this.explicitlyCleared) {
                    return
                }
                var cm = this.doc.cm, withOp = cm && !cm.curOp;
                if (withOp) {
                    startOperation(cm);
                }
                if (hasHandler(this, "clear")) {
                    var found = this.find();
                    if (found) {
                        signalLater(this, "clear", found.from, found.to);
                    }
                }
                var min = null, max = null;
                for (var i = 0; i < this.lines.length; ++i) {
                    var line = this$1.lines[i];
                    var span = getMarkedSpanFor(line.markedSpans, this$1);
                    if (cm && !this$1.collapsed) {
                        regLineChange(cm, lineNo(line), "text");
                    } else if (cm) {
                        if (span.to != null) {
                            max = lineNo(line);
                        }
                        if (span.from != null) {
                            min = lineNo(line);
                        }
                    }
                    line.markedSpans = removeMarkedSpan(line.markedSpans, span);
                    if (span.from == null && this$1.collapsed && !lineIsHidden(this$1.doc, line) && cm) {
                        updateLineHeight(line, textHeight(cm.display));
                    }
                }
                if (cm && this.collapsed && !cm.options.lineWrapping) {
                    for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
                        var visual = visualLine(this$1.lines[i$1]), len = lineLength(visual);
                        if (len > cm.display.maxLineLength) {
                            cm.display.maxLine = visual;
                            cm.display.maxLineLength = len;
                            cm.display.maxLineChanged = true;
                        }
                    }
                }

                if (min != null && cm && this.collapsed) {
                    regChange(cm, min, max + 1);
                }
                this.lines.length = 0;
                this.explicitlyCleared = true;
                if (this.atomic && this.doc.cantEdit) {
                    this.doc.cantEdit = false;
                    if (cm) {
                        reCheckSelection(cm.doc);
                    }
                }
                if (cm) {
                    signalLater(cm, "markerCleared", cm, this, min, max);
                }
                if (withOp) {
                    endOperation(cm);
                }
                if (this.parent) {
                    this.parent.clear();
                }
            };

            // Find the position of the marker in the document. Returns a {from,
            // to} object by default. Side can be passed to get a specific side
            // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
            // Pos objects returned contain a line object, rather than a line
            // number (used to prevent looking up the same line twice).
            TextMarker.prototype.find = function (side, lineObj) {
                var this$1 = this;

                if (side == null && this.type == "bookmark") {
                    side = 1;
                }
                var from, to;
                for (var i = 0; i < this.lines.length; ++i) {
                    var line = this$1.lines[i];
                    var span = getMarkedSpanFor(line.markedSpans, this$1);
                    if (span.from != null) {
                        from = Pos(lineObj ? line : lineNo(line), span.from);
                        if (side == -1) {
                            return from
                        }
                    }
                    if (span.to != null) {
                        to = Pos(lineObj ? line : lineNo(line), span.to);
                        if (side == 1) {
                            return to
                        }
                    }
                }
                return from && {from: from, to: to}
            };

            // Signals that the marker's widget changed, and surrounding layout
            // should be recomputed.
            TextMarker.prototype.changed = function () {
                var this$1 = this;

                var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
                if (!pos || !cm) {
                    return
                }
                runInOp(cm, function () {
                    var line = pos.line, lineN = lineNo(pos.line);
                    var view = findViewForLine(cm, lineN);
                    if (view) {
                        clearLineMeasurementCacheFor(view);
                        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
                    }
                    cm.curOp.updateMaxLine = true;
                    if (!lineIsHidden(widget.doc, line) && widget.height != null) {
                        var oldHeight = widget.height;
                        widget.height = null;
                        var dHeight = widgetHeight(widget) - oldHeight;
                        if (dHeight) {
                            updateLineHeight(line, line.height + dHeight);
                        }
                    }
                    signalLater(cm, "markerChanged", cm, this$1);
                });
            };

            TextMarker.prototype.attachLine = function (line) {
                if (!this.lines.length && this.doc.cm) {
                    var op = this.doc.cm.curOp;
                    if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1) {
                        (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);
                    }
                }
                this.lines.push(line);
            };

            TextMarker.prototype.detachLine = function (line) {
                this.lines.splice(indexOf(this.lines, line), 1);
                if (!this.lines.length && this.doc.cm) {
                    var op = this.doc.cm.curOp
                    ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
                }
            };
            eventMixin(TextMarker);

            // Create a marker, wire it up to the right lines, and
            function markText(doc, from, to, options, type) {
                // Shared markers (across linked documents) are handled separately
                // (markTextShared will call out to this again, once per
                // document).
                if (options && options.shared) {
                    return markTextShared(doc, from, to, options, type)
                }
                // Ensure we are in an operation.
                if (doc.cm && !doc.cm.curOp) {
                    return operation(doc.cm, markText)(doc, from, to, options, type)
                }

                var marker = new TextMarker(doc, type), diff = cmp(from, to);
                if (options) {
                    copyObj(options, marker, false);
                }
                // Don't connect empty markers unless clearWhenEmpty is false
                if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false) {
                    return marker
                }
                if (marker.replacedWith) {
                    // Showing up as a widget implies collapsed (widget replaces text)
                    marker.collapsed = true;
                    marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
                    if (!options.handleMouseEvents) {
                        marker.widgetNode.setAttribute("cm-ignore-events", "true");
                    }
                    if (options.insertLeft) {
                        marker.widgetNode.insertLeft = true;
                    }
                }
                if (marker.collapsed) {
                    if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
                        from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker)) {
                        throw new Error("Inserting collapsed marker partially overlapping an existing one")
                    }
                    seeCollapsedSpans();
                }

                if (marker.addToHistory) {
                    addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN);
                }

                var curLine = from.line, cm = doc.cm, updateMaxLine;
                doc.iter(curLine, to.line + 1, function (line) {
                    if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine) {
                        updateMaxLine = true;
                    }
                    if (marker.collapsed && curLine != from.line) {
                        updateLineHeight(line, 0);
                    }
                    addMarkedSpan(line, new MarkedSpan(marker,
                        curLine == from.line ? from.ch : null,
                        curLine == to.line ? to.ch : null));
                    ++curLine;
                });
                // lineIsHidden depends on the presence of the spans, so needs a second pass
                if (marker.collapsed) {
                    doc.iter(from.line, to.line + 1, function (line) {
                        if (lineIsHidden(doc, line)) {
                            updateLineHeight(line, 0);
                        }
                    });
                }

                if (marker.clearOnEnter) {
                    on(marker, "beforeCursorEnter", function () {
                        return marker.clear();
                    });
                }

                if (marker.readOnly) {
                    seeReadOnlySpans();
                    if (doc.history.done.length || doc.history.undone.length) {
                        doc.clearHistory();
                    }
                }
                if (marker.collapsed) {
                    marker.id = ++nextMarkerId;
                    marker.atomic = true;
                }
                if (cm) {
                    // Sync editor state
                    if (updateMaxLine) {
                        cm.curOp.updateMaxLine = true;
                    }
                    if (marker.collapsed) {
                        regChange(cm, from.line, to.line + 1);
                    } else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css) {
                        for (var i = from.line; i <= to.line; i++) {
                            regLineChange(cm, i, "text");
                        }
                    }
                    if (marker.atomic) {
                        reCheckSelection(cm.doc);
                    }
                    signalLater(cm, "markerAdded", cm, marker);
                }
                return marker
            }

            // SHARED TEXTMARKERS

            // A shared marker spans multiple linked documents. It is
            // implemented as a meta-marker-object controlling multiple normal
            // markers.
            var SharedTextMarker = function (markers, primary) {
                var this$1 = this;

                this.markers = markers;
                this.primary = primary;
                for (var i = 0; i < markers.length; ++i) {
                    markers[i].parent = this$1;
                }
            };

            SharedTextMarker.prototype.clear = function () {
                var this$1 = this;

                if (this.explicitlyCleared) {
                    return
                }
                this.explicitlyCleared = true;
                for (var i = 0; i < this.markers.length; ++i) {
                    this$1.markers[i].clear();
                }
                signalLater(this, "clear");
            };

            SharedTextMarker.prototype.find = function (side, lineObj) {
                return this.primary.find(side, lineObj)
            };
            eventMixin(SharedTextMarker);

            function markTextShared(doc, from, to, options, type) {
                options = copyObj(options);
                options.shared = false;
                var markers = [markText(doc, from, to, options, type)], primary = markers[0];
                var widget = options.widgetNode;
                linkedDocs(doc, function (doc) {
                    if (widget) {
                        options.widgetNode = widget.cloneNode(true);
                    }
                    markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
                    for (var i = 0; i < doc.linked.length; ++i) {
                        if (doc.linked[i].isParent) {
                            return
                        }
                    }
                    primary = lst(markers);
                });
                return new SharedTextMarker(markers, primary)
            }

            function findSharedMarkers(doc) {
                return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) {
                    return m.parent;
                })
            }

            function copySharedMarkers(doc, markers) {
                for (var i = 0; i < markers.length; i++) {
                    var marker = markers[i], pos = marker.find();
                    var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
                    if (cmp(mFrom, mTo)) {
                        var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
                        marker.markers.push(subMark);
                        subMark.parent = marker;
                    }
                }
            }

            function detachSharedMarkers(markers) {
                var loop = function (i) {
                    var marker = markers[i], linked = [marker.primary.doc];
                    linkedDocs(marker.primary.doc, function (d) {
                        return linked.push(d);
                    });
                    for (var j = 0; j < marker.markers.length; j++) {
                        var subMarker = marker.markers[j];
                        if (indexOf(linked, subMarker.doc) == -1) {
                            subMarker.parent = null;
                            marker.markers.splice(j--, 1);
                        }
                    }
                };

                for (var i = 0; i < markers.length; i++) loop(i);
            }

            var nextDocId = 0;
            var Doc = function (text, mode, firstLine, lineSep, direction) {
                if (!(this instanceof Doc)) {
                    return new Doc(text, mode, firstLine, lineSep, direction)
                }
                if (firstLine == null) {
                    firstLine = 0;
                }

                BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
                this.first = firstLine;
                this.scrollTop = this.scrollLeft = 0;
                this.cantEdit = false;
                this.cleanGeneration = 1;
                this.modeFrontier = this.highlightFrontier = firstLine;
                var start = Pos(firstLine, 0);
                this.sel = simpleSelection(start);
                this.history = new History(null);
                this.id = ++nextDocId;
                this.modeOption = mode;
                this.lineSep = lineSep;
                this.direction = (direction == "rtl") ? "rtl" : "ltr";
                this.extend = false;

                if (typeof text == "string") {
                    text = this.splitLines(text);
                }
                updateDoc(this, {from: start, to: start, text: text});
                setSelection(this, simpleSelection(start), sel_dontScroll);
            };

            Doc.prototype = createObj(BranchChunk.prototype, {
                constructor: Doc,
                // Iterate over the document. Supports two forms -- with only one
                // argument, it calls that for each line in the document. With
                // three, it iterates over the range given by the first two (with
                // the second being non-inclusive).
                iter: function (from, to, op) {
                    if (op) {
                        this.iterN(from - this.first, to - from, op);
                    } else {
                        this.iterN(this.first, this.first + this.size, from);
                    }
                },

                // Non-public interface for adding and removing lines.
                insert: function (at, lines) {
                    var height = 0;
                    for (var i = 0; i < lines.length; ++i) {
                        height += lines[i].height;
                    }
                    this.insertInner(at - this.first, lines, height);
                },
                remove: function (at, n) {
                    this.removeInner(at - this.first, n);
                },

                // From here, the methods are part of the public interface. Most
                // are also available from CodeMirror (editor) instances.

                getValue: function (lineSep) {
                    var lines = getLines(this, this.first, this.first + this.size);
                    if (lineSep === false) {
                        return lines
                    }
                    return lines.join(lineSep || this.lineSeparator())
                },
                setValue: docMethodOp(function (code) {
                    var top = Pos(this.first, 0), last = this.first + this.size - 1;
                    makeChange(this, {
                        from: top, to: Pos(last, getLine(this, last).text.length),
                        text: this.splitLines(code), origin: "setValue", full: true
                    }, true);
                    if (this.cm) {
                        scrollToCoords(this.cm, 0, 0);
                    }
                    setSelection(this, simpleSelection(top), sel_dontScroll);
                }),
                replaceRange: function (code, from, to, origin) {
                    from = clipPos(this, from);
                    to = to ? clipPos(this, to) : from;
                    replaceRange(this, code, from, to, origin);
                },
                getRange: function (from, to, lineSep) {
                    var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
                    if (lineSep === false) {
                        return lines
                    }
                    return lines.join(lineSep || this.lineSeparator())
                },

                getLine: function (line) {
                    var l = this.getLineHandle(line);
                    return l && l.text
                },

                getLineHandle: function (line) {
                    if (isLine(this, line)) {
                        return getLine(this, line)
                    }
                },
                getLineNumber: function (line) {
                    return lineNo(line)
                },

                getLineHandleVisualStart: function (line) {
                    if (typeof line == "number") {
                        line = getLine(this, line);
                    }
                    return visualLine(line)
                },

                lineCount: function () {
                    return this.size
                },
                firstLine: function () {
                    return this.first
                },
                lastLine: function () {
                    return this.first + this.size - 1
                },

                clipPos: function (pos) {
                    return clipPos(this, pos)
                },

                getCursor: function (start) {
                    var range$$1 = this.sel.primary(), pos;
                    if (start == null || start == "head") {
                        pos = range$$1.head;
                    } else if (start == "anchor") {
                        pos = range$$1.anchor;
                    } else if (start == "end" || start == "to" || start === false) {
                        pos = range$$1.to();
                    } else {
                        pos = range$$1.from();
                    }
                    return pos
                },
                listSelections: function () {
                    return this.sel.ranges
                },
                somethingSelected: function () {
                    return this.sel.somethingSelected()
                },

                setCursor: docMethodOp(function (line, ch, options) {
                    setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
                }),
                setSelection: docMethodOp(function (anchor, head, options) {
                    setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
                }),
                extendSelection: docMethodOp(function (head, other, options) {
                    extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
                }),
                extendSelections: docMethodOp(function (heads, options) {
                    extendSelections(this, clipPosArray(this, heads), options);
                }),
                extendSelectionsBy: docMethodOp(function (f, options) {
                    var heads = map(this.sel.ranges, f);
                    extendSelections(this, clipPosArray(this, heads), options);
                }),
                setSelections: docMethodOp(function (ranges, primary, options) {
                    var this$1 = this;

                    if (!ranges.length) {
                        return
                    }
                    var out = [];
                    for (var i = 0; i < ranges.length; i++) {
                        out[i] = new Range(clipPos(this$1, ranges[i].anchor),
                            clipPos(this$1, ranges[i].head));
                    }
                    if (primary == null) {
                        primary = Math.min(ranges.length - 1, this.sel.primIndex);
                    }
                    setSelection(this, normalizeSelection(this.cm, out, primary), options);
                }),
                addSelection: docMethodOp(function (anchor, head, options) {
                    var ranges = this.sel.ranges.slice(0);
                    ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
                    setSelection(this, normalizeSelection(this.cm, ranges, ranges.length - 1), options);
                }),

                getSelection: function (lineSep) {
                    var this$1 = this;

                    var ranges = this.sel.ranges, lines;
                    for (var i = 0; i < ranges.length; i++) {
                        var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
                        lines = lines ? lines.concat(sel) : sel;
                    }
                    if (lineSep === false) {
                        return lines
                    } else {
                        return lines.join(lineSep || this.lineSeparator())
                    }
                },
                getSelections: function (lineSep) {
                    var this$1 = this;

                    var parts = [], ranges = this.sel.ranges;
                    for (var i = 0; i < ranges.length; i++) {
                        var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
                        if (lineSep !== false) {
                            sel = sel.join(lineSep || this$1.lineSeparator());
                        }
                        parts[i] = sel;
                    }
                    return parts
                },
                replaceSelection: function (code, collapse, origin) {
                    var dup = [];
                    for (var i = 0; i < this.sel.ranges.length; i++) {
                        dup[i] = code;
                    }
                    this.replaceSelections(dup, collapse, origin || "+input");
                },
                replaceSelections: docMethodOp(function (code, collapse, origin) {
                    var this$1 = this;

                    var changes = [], sel = this.sel;
                    for (var i = 0; i < sel.ranges.length; i++) {
                        var range$$1 = sel.ranges[i];
                        changes[i] = {
                            from: range$$1.from(),
                            to: range$$1.to(),
                            text: this$1.splitLines(code[i]),
                            origin: origin
                        };
                    }
                    var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
                    for (var i$1 = changes.length - 1; i$1 >= 0; i$1--) {
                        makeChange(this$1, changes[i$1]);
                    }
                    if (newSel) {
                        setSelectionReplaceHistory(this, newSel);
                    } else if (this.cm) {
                        ensureCursorVisible(this.cm);
                    }
                }),
                undo: docMethodOp(function () {
                    makeChangeFromHistory(this, "undo");
                }),
                redo: docMethodOp(function () {
                    makeChangeFromHistory(this, "redo");
                }),
                undoSelection: docMethodOp(function () {
                    makeChangeFromHistory(this, "undo", true);
                }),
                redoSelection: docMethodOp(function () {
                    makeChangeFromHistory(this, "redo", true);
                }),

                setExtending: function (val) {
                    this.extend = val;
                },
                getExtending: function () {
                    return this.extend
                },

                historySize: function () {
                    var hist = this.history, done = 0, undone = 0;
                    for (var i = 0; i < hist.done.length; i++) {
                        if (!hist.done[i].ranges) {
                            ++done;
                        }
                    }
                    for (var i$1 = 0; i$1 < hist.undone.length; i$1++) {
                        if (!hist.undone[i$1].ranges) {
                            ++undone;
                        }
                    }
                    return {undo: done, redo: undone}
                },
                clearHistory: function () {
                    this.history = new History(this.history.maxGeneration);
                },

                markClean: function () {
                    this.cleanGeneration = this.changeGeneration(true);
                },
                changeGeneration: function (forceSplit) {
                    if (forceSplit) {
                        this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null;
                    }
                    return this.history.generation
                },
                isClean: function (gen) {
                    return this.history.generation == (gen || this.cleanGeneration)
                },

                getHistory: function () {
                    return {
                        done: copyHistoryArray(this.history.done),
                        undone: copyHistoryArray(this.history.undone)
                    }
                },
                setHistory: function (histData) {
                    var hist = this.history = new History(this.history.maxGeneration);
                    hist.done = copyHistoryArray(histData.done.slice(0), null, true);
                    hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
                },

                setGutterMarker: docMethodOp(function (line, gutterID, value) {
                    return changeLine(this, line, "gutter", function (line) {
                        var markers = line.gutterMarkers || (line.gutterMarkers = {});
                        markers[gutterID] = value;
                        if (!value && isEmpty(markers)) {
                            line.gutterMarkers = null;
                        }
                        return true
                    })
                }),

                clearGutter: docMethodOp(function (gutterID) {
                    var this$1 = this;

                    this.iter(function (line) {
                        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
                            changeLine(this$1, line, "gutter", function () {
                                line.gutterMarkers[gutterID] = null;
                                if (isEmpty(line.gutterMarkers)) {
                                    line.gutterMarkers = null;
                                }
                                return true
                            });
                        }
                    });
                }),

                lineInfo: function (line) {
                    var n;
                    if (typeof line == "number") {
                        if (!isLine(this, line)) {
                            return null
                        }
                        n = line;
                        line = getLine(this, line);
                        if (!line) {
                            return null
                        }
                    } else {
                        n = lineNo(line);
                        if (n == null) {
                            return null
                        }
                    }
                    return {
                        line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
                        textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
                        widgets: line.widgets
                    }
                },

                addLineClass: docMethodOp(function (handle, where, cls) {
                    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
                        var prop = where == "text" ? "textClass"
                            : where == "background" ? "bgClass"
                                : where == "gutter" ? "gutterClass" : "wrapClass";
                        if (!line[prop]) {
                            line[prop] = cls;
                        } else if (classTest(cls).test(line[prop])) {
                            return false
                        } else {
                            line[prop] += " " + cls;
                        }
                        return true
                    })
                }),
                removeLineClass: docMethodOp(function (handle, where, cls) {
                    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
                        var prop = where == "text" ? "textClass"
                            : where == "background" ? "bgClass"
                                : where == "gutter" ? "gutterClass" : "wrapClass";
                        var cur = line[prop];
                        if (!cur) {
                            return false
                        } else if (cls == null) {
                            line[prop] = null;
                        } else {
                            var found = cur.match(classTest(cls));
                            if (!found) {
                                return false
                            }
                            var end = found.index + found[0].length;
                            line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
                        }
                        return true
                    })
                }),

                addLineWidget: docMethodOp(function (handle, node, options) {
                    return addLineWidget(this, handle, node, options)
                }),
                removeLineWidget: function (widget) {
                    widget.clear();
                },

                markText: function (from, to, options) {
                    return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
                },
                setBookmark: function (pos, options) {
                    var realOpts = {
                        replacedWith: options && (options.nodeType == null ? options.widget : options),
                        insertLeft: options && options.insertLeft,
                        clearWhenEmpty: false, shared: options && options.shared,
                        handleMouseEvents: options && options.handleMouseEvents
                    };
                    pos = clipPos(this, pos);
                    return markText(this, pos, pos, realOpts, "bookmark")
                },
                findMarksAt: function (pos) {
                    pos = clipPos(this, pos);
                    var markers = [], spans = getLine(this, pos.line).markedSpans;
                    if (spans) {
                        for (var i = 0; i < spans.length; ++i) {
                            var span = spans[i];
                            if ((span.from == null || span.from <= pos.ch) &&
                                (span.to == null || span.to >= pos.ch)) {
                                markers.push(span.marker.parent || span.marker);
                            }
                        }
                    }
                    return markers
                },
                findMarks: function (from, to, filter) {
                    from = clipPos(this, from);
                    to = clipPos(this, to);
                    var found = [], lineNo$$1 = from.line;
                    this.iter(from.line, to.line + 1, function (line) {
                        var spans = line.markedSpans;
                        if (spans) {
                            for (var i = 0; i < spans.length; i++) {
                                var span = spans[i];
                                if (!(span.to != null && lineNo$$1 == from.line && from.ch >= span.to ||
                                    span.from == null && lineNo$$1 != from.line ||
                                    span.from != null && lineNo$$1 == to.line && span.from >= to.ch) &&
                                    (!filter || filter(span.marker))) {
                                    found.push(span.marker.parent || span.marker);
                                }
                            }
                        }
                        ++lineNo$$1;
                    });
                    return found
                },
                getAllMarks: function () {
                    var markers = [];
                    this.iter(function (line) {
                        var sps = line.markedSpans;
                        if (sps) {
                            for (var i = 0; i < sps.length; ++i) {
                                if (sps[i].from != null) {
                                    markers.push(sps[i].marker);
                                }
                            }
                        }
                    });
                    return markers
                },

                posFromIndex: function (off) {
                    var ch, lineNo$$1 = this.first, sepSize = this.lineSeparator().length;
                    this.iter(function (line) {
                        var sz = line.text.length + sepSize;
                        if (sz > off) {
                            ch = off;
                            return true
                        }
                        off -= sz;
                        ++lineNo$$1;
                    });
                    return clipPos(this, Pos(lineNo$$1, ch))
                },
                indexFromPos: function (coords) {
                    coords = clipPos(this, coords);
                    var index = coords.ch;
                    if (coords.line < this.first || coords.ch < 0) {
                        return 0
                    }
                    var sepSize = this.lineSeparator().length;
                    this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
                        index += line.text.length + sepSize;
                    });
                    return index
                },

                copy: function (copyHistory) {
                    var doc = new Doc(getLines(this, this.first, this.first + this.size),
                        this.modeOption, this.first, this.lineSep, this.direction);
                    doc.scrollTop = this.scrollTop;
                    doc.scrollLeft = this.scrollLeft;
                    doc.sel = this.sel;
                    doc.extend = false;
                    if (copyHistory) {
                        doc.history.undoDepth = this.history.undoDepth;
                        doc.setHistory(this.getHistory());
                    }
                    return doc
                },

                linkedDoc: function (options) {
                    if (!options) {
                        options = {};
                    }
                    var from = this.first, to = this.first + this.size;
                    if (options.from != null && options.from > from) {
                        from = options.from;
                    }
                    if (options.to != null && options.to < to) {
                        to = options.to;
                    }
                    var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
                    if (options.sharedHist) {
                        copy.history = this.history
                        ;
                    }
                    (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
                    copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
                    copySharedMarkers(copy, findSharedMarkers(this));
                    return copy
                },
                unlinkDoc: function (other) {
                    var this$1 = this;

                    if (other instanceof CodeMirror) {
                        other = other.doc;
                    }
                    if (this.linked) {
                        for (var i = 0; i < this.linked.length; ++i) {
                            var link = this$1.linked[i];
                            if (link.doc != other) {
                                continue
                            }
                            this$1.linked.splice(i, 1);
                            other.unlinkDoc(this$1);
                            detachSharedMarkers(findSharedMarkers(this$1));
                            break
                        }
                    }
                    // If the histories were shared, split them again
                    if (other.history == this.history) {
                        var splitIds = [other.id];
                        linkedDocs(other, function (doc) {
                            return splitIds.push(doc.id);
                        }, true);
                        other.history = new History(null);
                        other.history.done = copyHistoryArray(this.history.done, splitIds);
                        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
                    }
                },
                iterLinkedDocs: function (f) {
                    linkedDocs(this, f);
                },

                getMode: function () {
                    return this.mode
                },
                getEditor: function () {
                    return this.cm
                },

                splitLines: function (str) {
                    if (this.lineSep) {
                        return str.split(this.lineSep)
                    }
                    return splitLinesAuto(str)
                },
                lineSeparator: function () {
                    return this.lineSep || "\n"
                },

                setDirection: docMethodOp(function (dir) {
                    if (dir != "rtl") {
                        dir = "ltr";
                    }
                    if (dir == this.direction) {
                        return
                    }
                    this.direction = dir;
                    this.iter(function (line) {
                        return line.order = null;
                    });
                    if (this.cm) {
                        directionChanged(this.cm);
                    }
                })
            });

            // Public alias.
            Doc.prototype.eachLine = Doc.prototype.iter;

            // Kludge to work around strange IE behavior where it'll sometimes
            // re-fire a series of drag-related events right after the drop (#1551)
            var lastDrop = 0;

            function onDrop(e) {
                var cm = this;
                clearDragCursor(cm);
                if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
                    return
                }
                e_preventDefault(e);
                if (ie) {
                    lastDrop = +new Date;
                }
                var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
                if (!pos || cm.isReadOnly()) {
                    return
                }
                // Might be a file drop, in which case we simply extract the text
                // and insert it.
                if (files && files.length && window.FileReader && window.File) {
                    var n = files.length, text = Array(n), read = 0;
                    var loadFile = function (file, i) {
                        if (cm.options.allowDropFileTypes &&
                            indexOf(cm.options.allowDropFileTypes, file.type) == -1) {
                            return
                        }

                        var reader = new FileReader;
                        reader.onload = operation(cm, function () {
                            var content = reader.result;
                            if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
                                content = "";
                            }
                            text[i] = content;
                            if (++read == n) {
                                pos = clipPos(cm.doc, pos);
                                var change = {
                                    from: pos, to: pos,
                                    text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
                                    origin: "paste"
                                };
                                makeChange(cm.doc, change);
                                setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
                            }
                        });
                        reader.readAsText(file);
                    };
                    for (var i = 0; i < n; ++i) {
                        loadFile(files[i], i);
                    }
                } else { // Normal drop
                    // Don't do a replace if the drop happened inside of the selected text.
                    if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
                        cm.state.draggingText(e);
                        // Ensure the editor is re-focused
                        setTimeout(function () {
                            return cm.display.input.focus();
                        }, 20);
                        return
                    }
                    try {
                        var text$1 = e.dataTransfer.getData("Text");
                        if (text$1) {
                            var selected;
                            if (cm.state.draggingText && !cm.state.draggingText.copy) {
                                selected = cm.listSelections();
                            }
                            setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
                            if (selected) {
                                for (var i$1 = 0; i$1 < selected.length; ++i$1) {
                                    replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag");
                                }
                            }
                            cm.replaceSelection(text$1, "around", "paste");
                            cm.display.input.focus();
                        }
                    } catch (e) {
                    }
                }
            }

            function onDragStart(cm, e) {
                if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) {
                    e_stop(e);
                    return
                }
                if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) {
                    return
                }

                e.dataTransfer.setData("Text", cm.getSelection());
                e.dataTransfer.effectAllowed = "copyMove";

                // Use dummy image instead of default browsers image.
                // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
                if (e.dataTransfer.setDragImage && !safari) {
                    var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
                    img.src = "";
                    if (presto) {
                        img.width = img.height = 1;
                        cm.display.wrapper.appendChild(img);
                        // Force a relayout, or Opera won't use our image for some obscure reason
                        img._top = img.offsetTop;
                    }
                    e.dataTransfer.setDragImage(img, 0, 0);
                    if (presto) {
                        img.parentNode.removeChild(img);
                    }
                }
            }

            function onDragOver(cm, e) {
                var pos = posFromMouse(cm, e);
                if (!pos) {
                    return
                }
                var frag = document.createDocumentFragment();
                drawSelectionCursor(cm, pos, frag);
                if (!cm.display.dragCursor) {
                    cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
                    cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
                }
                removeChildrenAndAdd(cm.display.dragCursor, frag);
            }

            function clearDragCursor(cm) {
                if (cm.display.dragCursor) {
                    cm.display.lineSpace.removeChild(cm.display.dragCursor);
                    cm.display.dragCursor = null;
                }
            }

            // These must be handled carefully, because naively registering a
            // handler for each editor will cause the editors to never be
            // garbage collected.

            function forEachCodeMirror(f) {
                if (!document.getElementsByClassName) {
                    return
                }
                var byClass = document.getElementsByClassName("CodeMirror");
                for (var i = 0; i < byClass.length; i++) {
                    var cm = byClass[i].CodeMirror;
                    if (cm) {
                        f(cm);
                    }
                }
            }

            var globalsRegistered = false;

            function ensureGlobalHandlers() {
                if (globalsRegistered) {
                    return
                }
                registerGlobalHandlers();
                globalsRegistered = true;
            }

            function registerGlobalHandlers() {
                // When the window resizes, we need to refresh active editors.
                var resizeTimer;
                on(window, "resize", function () {
                    if (resizeTimer == null) {
                        resizeTimer = setTimeout(function () {
                            resizeTimer = null;
                            forEachCodeMirror(onResize);
                        }, 100);
                    }
                });
                // When the window loses focus, we want to show the editor as blurred
                on(window, "blur", function () {
                    return forEachCodeMirror(onBlur);
                });
            }

            // Called when the window resizes
            function onResize(cm) {
                var d = cm.display;
                // Might be a text scaling operation, clear size caches.
                d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
                d.scrollbarsClipped = false;
                cm.setSize();
            }

            var keyNames = {
                3: "Pause", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
                19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
                36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
                46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
                106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 127: "Delete", 145: "ScrollLock",
                173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
                221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
                63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
            };

            // Number keys
            for (var i = 0; i < 10; i++) {
                keyNames[i + 48] = keyNames[i + 96] = String(i);
            }
            // Alphabetic keys
            for (var i$1 = 65; i$1 <= 90; i$1++) {
                keyNames[i$1] = String.fromCharCode(i$1);
            }
            // Function keys
            for (var i$2 = 1; i$2 <= 12; i$2++) {
                keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2;
            }

            var keyMap = {};

            keyMap.basic = {
                "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
                "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
                "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
                "Tab": "defaultTab", "Shift-Tab": "indentAuto",
                "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
                "Esc": "singleSelection"
            };
            // Note that the save and find-related commands aren't defined by
            // default. User code or addons can define them. Unknown commands
            // are simply ignored.
            keyMap.pcDefault = {
                "Ctrl-A": "selectAll",
                "Ctrl-D": "deleteLine",
                "Ctrl-Z": "undo",
                "Shift-Ctrl-Z": "redo",
                "Ctrl-Y": "redo",
                "Ctrl-Home": "goDocStart",
                "Ctrl-End": "goDocEnd",
                "Ctrl-Up": "goLineUp",
                "Ctrl-Down": "goLineDown",
                "Ctrl-Left": "goGroupLeft",
                "Ctrl-Right": "goGroupRight",
                "Alt-Left": "goLineStart",
                "Alt-Right": "goLineEnd",
                "Ctrl-Backspace": "delGroupBefore",
                "Ctrl-Delete": "delGroupAfter",
                "Ctrl-S": "save",
                "Ctrl-F": "find",
                "Ctrl-G": "findNext",
                "Shift-Ctrl-G": "findPrev",
                "Shift-Ctrl-F": "replace",
                "Shift-Ctrl-R": "replaceAll",
                "Ctrl-[": "indentLess",
                "Ctrl-]": "indentMore",
                "Ctrl-U": "undoSelection",
                "Shift-Ctrl-U": "redoSelection",
                "Alt-U": "redoSelection",
                "fallthrough": "basic"
            };
            // Very basic readline/emacs-style bindings, which are standard on Mac.
            keyMap.emacsy = {
                "Ctrl-F": "goCharRight",
                "Ctrl-B": "goCharLeft",
                "Ctrl-P": "goLineUp",
                "Ctrl-N": "goLineDown",
                "Alt-F": "goWordRight",
                "Alt-B": "goWordLeft",
                "Ctrl-A": "goLineStart",
                "Ctrl-E": "goLineEnd",
                "Ctrl-V": "goPageDown",
                "Shift-Ctrl-V": "goPageUp",
                "Ctrl-D": "delCharAfter",
                "Ctrl-H": "delCharBefore",
                "Alt-D": "delWordAfter",
                "Alt-Backspace": "delWordBefore",
                "Ctrl-K": "killLine",
                "Ctrl-T": "transposeChars",
                "Ctrl-O": "openLine"
            };
            keyMap.macDefault = {
                "Cmd-A": "selectAll",
                "Cmd-D": "deleteLine",
                "Cmd-Z": "undo",
                "Shift-Cmd-Z": "redo",
                "Cmd-Y": "redo",
                "Cmd-Home": "goDocStart",
                "Cmd-Up": "goDocStart",
                "Cmd-End": "goDocEnd",
                "Cmd-Down": "goDocEnd",
                "Alt-Left": "goGroupLeft",
                "Alt-Right": "goGroupRight",
                "Cmd-Left": "goLineLeft",
                "Cmd-Right": "goLineRight",
                "Alt-Backspace": "delGroupBefore",
                "Ctrl-Alt-Backspace": "delGroupAfter",
                "Alt-Delete": "delGroupAfter",
                "Cmd-S": "save",
                "Cmd-F": "find",
                "Cmd-G": "findNext",
                "Shift-Cmd-G": "findPrev",
                "Cmd-Alt-F": "replace",
                "Shift-Cmd-Alt-F": "replaceAll",
                "Cmd-[": "indentLess",
                "Cmd-]": "indentMore",
                "Cmd-Backspace": "delWrappedLineLeft",
                "Cmd-Delete": "delWrappedLineRight",
                "Cmd-U": "undoSelection",
                "Shift-Cmd-U": "redoSelection",
                "Ctrl-Up": "goDocStart",
                "Ctrl-Down": "goDocEnd",
                "fallthrough": ["basic", "emacsy"]
            };
            keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

            // KEYMAP DISPATCH

            function normalizeKeyName(name) {
                var parts = name.split(/-(?!$)/);
                name = parts[parts.length - 1];
                var alt, ctrl, shift, cmd;
                for (var i = 0; i < parts.length - 1; i++) {
                    var mod = parts[i];
                    if (/^(cmd|meta|m)$/i.test(mod)) {
                        cmd = true;
                    } else if (/^a(lt)?$/i.test(mod)) {
                        alt = true;
                    } else if (/^(c|ctrl|control)$/i.test(mod)) {
                        ctrl = true;
                    } else if (/^s(hift)?$/i.test(mod)) {
                        shift = true;
                    } else {
                        throw new Error("Unrecognized modifier name: " + mod)
                    }
                }
                if (alt) {
                    name = "Alt-" + name;
                }
                if (ctrl) {
                    name = "Ctrl-" + name;
                }
                if (cmd) {
                    name = "Cmd-" + name;
                }
                if (shift) {
                    name = "Shift-" + name;
                }
                return name
            }

            // This is a kludge to keep keymaps mostly working as raw objects
            // (backwards compatibility) while at the same time support features
            // like normalization and multi-stroke key bindings. It compiles a
            // new normalized keymap, and then updates the old object to reflect
            // this.
            function normalizeKeyMap(keymap) {
                var copy = {};
                for (var keyname in keymap) {
                    if (keymap.hasOwnProperty(keyname)) {
                        var value = keymap[keyname];
                        if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) {
                            continue
                        }
                        if (value == "...") {
                            delete keymap[keyname];
                            continue
                        }

                        var keys = map(keyname.split(" "), normalizeKeyName);
                        for (var i = 0; i < keys.length; i++) {
                            var val = (void 0), name = (void 0);
                            if (i == keys.length - 1) {
                                name = keys.join(" ");
                                val = value;
                            } else {
                                name = keys.slice(0, i + 1).join(" ");
                                val = "...";
                            }
                            var prev = copy[name];
                            if (!prev) {
                                copy[name] = val;
                            } else if (prev != val) {
                                throw new Error("Inconsistent bindings for " + name)
                            }
                        }
                        delete keymap[keyname];
                    }
                }
                for (var prop in copy) {
                    keymap[prop] = copy[prop];
                }
                return keymap
            }

            function lookupKey(key, map$$1, handle, context) {
                map$$1 = getKeyMap(map$$1);
                var found = map$$1.call ? map$$1.call(key, context) : map$$1[key];
                if (found === false) {
                    return "nothing"
                }
                if (found === "...") {
                    return "multi"
                }
                if (found != null && handle(found)) {
                    return "handled"
                }

                if (map$$1.fallthrough) {
                    if (Object.prototype.toString.call(map$$1.fallthrough) != "[object Array]") {
                        return lookupKey(key, map$$1.fallthrough, handle, context)
                    }
                    for (var i = 0; i < map$$1.fallthrough.length; i++) {
                        var result = lookupKey(key, map$$1.fallthrough[i], handle, context);
                        if (result) {
                            return result
                        }
                    }
                }
            }

            // Modifier key presses don't count as 'real' key presses for the
            // purpose of keymap fallthrough.
            function isModifierKey(value) {
                var name = typeof value == "string" ? value : keyNames[value.keyCode];
                return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
            }

            function addModifierNames(name, event, noShift) {
                var base = name;
                if (event.altKey && base != "Alt") {
                    name = "Alt-" + name;
                }
                if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") {
                    name = "Ctrl-" + name;
                }
                if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") {
                    name = "Cmd-" + name;
                }
                if (!noShift && event.shiftKey && base != "Shift") {
                    name = "Shift-" + name;
                }
                return name
            }

            // Look up the name of a key as indicated by an event object.
            function keyName(event, noShift) {
                if (presto && event.keyCode == 34 && event["char"]) {
                    return false
                }
                var name = keyNames[event.keyCode];
                if (name == null || event.altGraphKey) {
                    return false
                }
                // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
                // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
                if (event.keyCode == 3 && event.code) {
                    name = event.code;
                }
                return addModifierNames(name, event, noShift)
            }

            function getKeyMap(val) {
                return typeof val == "string" ? keyMap[val] : val
            }

            // Helper for deleting text near the selection(s), used to implement
            // backspace, delete, and similar functionality.
            function deleteNearSelection(cm, compute) {
                var ranges = cm.doc.sel.ranges, kill = [];
                // Build up a set of ranges to kill first, merging overlapping
                // ranges.
                for (var i = 0; i < ranges.length; i++) {
                    var toKill = compute(ranges[i]);
                    while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
                        var replaced = kill.pop();
                        if (cmp(replaced.from, toKill.from) < 0) {
                            toKill.from = replaced.from;
                            break
                        }
                    }
                    kill.push(toKill);
                }
                // Next, remove those actual ranges.
                runInOp(cm, function () {
                    for (var i = kill.length - 1; i >= 0; i--) {
                        replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete");
                    }
                    ensureCursorVisible(cm);
                });
            }

            function moveCharLogically(line, ch, dir) {
                var target = skipExtendingChars(line.text, ch + dir, dir);
                return target < 0 || target > line.text.length ? null : target
            }

            function moveLogically(line, start, dir) {
                var ch = moveCharLogically(line, start.ch, dir);
                return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
            }

            function endOfLine(visually, cm, lineObj, lineNo, dir) {
                if (visually) {
                    var order = getOrder(lineObj, cm.doc.direction);
                    if (order) {
                        var part = dir < 0 ? lst(order) : order[0];
                        var moveInStorageOrder = (dir < 0) == (part.level == 1);
                        var sticky = moveInStorageOrder ? "after" : "before";
                        var ch;
                        // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
                        // it could be that the last bidi part is not on the last visual line,
                        // since visual lines contain content order-consecutive chunks.
                        // Thus, in rtl, we are looking for the first (content-order) character
                        // in the rtl chunk that is on the last line (that is, the same line
                        // as the last (content-order) character).
                        if (part.level > 0 || cm.doc.direction == "rtl") {
                            var prep = prepareMeasureForLine(cm, lineObj);
                            ch = dir < 0 ? lineObj.text.length - 1 : 0;
                            var targetTop = measureCharPrepared(cm, prep, ch).top;
                            ch = findFirst(function (ch) {
                                return measureCharPrepared(cm, prep, ch).top == targetTop;
                            }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
                            if (sticky == "before") {
                                ch = moveCharLogically(lineObj, ch, 1);
                            }
                        } else {
                            ch = dir < 0 ? part.to : part.from;
                        }
                        return new Pos(lineNo, ch, sticky)
                    }
                }
                return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
            }

            function moveVisually(cm, line, start, dir) {
                var bidi = getOrder(line, cm.doc.direction);
                if (!bidi) {
                    return moveLogically(line, start, dir)
                }
                if (start.ch >= line.text.length) {
                    start.ch = line.text.length;
                    start.sticky = "before";
                } else if (start.ch <= 0) {
                    start.ch = 0;
                    start.sticky = "after";
                }
                var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];
                if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
                    // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
                    // nothing interesting happens.
                    return moveLogically(line, start, dir)
                }

                var mv = function (pos, dir) {
                    return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir);
                };
                var prep;
                var getWrappedLineExtent = function (ch) {
                    if (!cm.options.lineWrapping) {
                        return {begin: 0, end: line.text.length}
                    }
                    prep = prep || prepareMeasureForLine(cm, line);
                    return wrappedLineExtentChar(cm, line, prep, ch)
                };
                var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);

                if (cm.doc.direction == "rtl" || part.level == 1) {
                    var moveInStorageOrder = (part.level == 1) == (dir < 0);
                    var ch = mv(start, moveInStorageOrder ? 1 : -1);
                    if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
                        // Case 2: We move within an rtl part or in an rtl editor on the same visual line
                        var sticky = moveInStorageOrder ? "before" : "after";
                        return new Pos(start.line, ch, sticky)
                    }
                }

                // Case 3: Could not move within this bidi part in this visual line, so leave
                // the current bidi part

                var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
                    var getRes = function (ch, moveInStorageOrder) {
                        return moveInStorageOrder
                            ? new Pos(start.line, mv(ch, 1), "before")
                            : new Pos(start.line, ch, "after");
                    };

                    for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
                        var part = bidi[partPos];
                        var moveInStorageOrder = (dir > 0) == (part.level != 1);
                        var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
                        if (part.from <= ch && ch < part.to) {
                            return getRes(ch, moveInStorageOrder)
                        }
                        ch = moveInStorageOrder ? part.from : mv(part.to, -1);
                        if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) {
                            return getRes(ch, moveInStorageOrder)
                        }
                    }
                };

                // Case 3a: Look for other bidi parts on the same visual line
                var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
                if (res) {
                    return res
                }

                // Case 3b: Look for other bidi parts on the next visual line
                var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
                if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
                    res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
                    if (res) {
                        return res
                    }
                }

                // Case 4: Nowhere to move
                return null
            }

            // Commands are parameter-less actions that can be performed on an
            // editor, mostly used for keybindings.
            var commands = {
                selectAll: selectAll,
                singleSelection: function (cm) {
                    return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll);
                },
                killLine: function (cm) {
                    return deleteNearSelection(cm, function (range) {
                        if (range.empty()) {
                            var len = getLine(cm.doc, range.head.line).text.length;
                            if (range.head.ch == len && range.head.line < cm.lastLine()) {
                                return {from: range.head, to: Pos(range.head.line + 1, 0)}
                            } else {
                                return {from: range.head, to: Pos(range.head.line, len)}
                            }
                        } else {
                            return {from: range.from(), to: range.to()}
                        }
                    });
                },
                deleteLine: function (cm) {
                    return deleteNearSelection(cm, function (range) {
                        return ({
                            from: Pos(range.from().line, 0),
                            to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
                        });
                    });
                },
                delLineLeft: function (cm) {
                    return deleteNearSelection(cm, function (range) {
                        return ({
                            from: Pos(range.from().line, 0), to: range.from()
                        });
                    });
                },
                delWrappedLineLeft: function (cm) {
                    return deleteNearSelection(cm, function (range) {
                        var top = cm.charCoords(range.head, "div").top + 5;
                        var leftPos = cm.coordsChar({left: 0, top: top}, "div");
                        return {from: leftPos, to: range.from()}
                    });
                },
                delWrappedLineRight: function (cm) {
                    return deleteNearSelection(cm, function (range) {
                        var top = cm.charCoords(range.head, "div").top + 5;
                        var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
                        return {from: range.from(), to: rightPos}
                    });
                },
                undo: function (cm) {
                    return cm.undo();
                },
                redo: function (cm) {
                    return cm.redo();
                },
                undoSelection: function (cm) {
                    return cm.undoSelection();
                },
                redoSelection: function (cm) {
                    return cm.redoSelection();
                },
                goDocStart: function (cm) {
                    return cm.extendSelection(Pos(cm.firstLine(), 0));
                },
                goDocEnd: function (cm) {
                    return cm.extendSelection(Pos(cm.lastLine()));
                },
                goLineStart: function (cm) {
                    return cm.extendSelectionsBy(function (range) {
                            return lineStart(cm, range.head.line);
                        },
                        {origin: "+move", bias: 1}
                    );
                },
                goLineStartSmart: function (cm) {
                    return cm.extendSelectionsBy(function (range) {
                            return lineStartSmart(cm, range.head);
                        },
                        {origin: "+move", bias: 1}
                    );
                },
                goLineEnd: function (cm) {
                    return cm.extendSelectionsBy(function (range) {
                            return lineEnd(cm, range.head.line);
                        },
                        {origin: "+move", bias: -1}
                    );
                },
                goLineRight: function (cm) {
                    return cm.extendSelectionsBy(function (range) {
                        var top = cm.cursorCoords(range.head, "div").top + 5;
                        return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
                    }, sel_move);
                },
                goLineLeft: function (cm) {
                    return cm.extendSelectionsBy(function (range) {
                        var top = cm.cursorCoords(range.head, "div").top + 5;
                        return cm.coordsChar({left: 0, top: top}, "div")
                    }, sel_move);
                },
                goLineLeftSmart: function (cm) {
                    return cm.extendSelectionsBy(function (range) {
                        var top = cm.cursorCoords(range.head, "div").top + 5;
                        var pos = cm.coordsChar({left: 0, top: top}, "div");
                        if (pos.ch < cm.getLine(pos.line).search(/\S/)) {
                            return lineStartSmart(cm, range.head)
                        }
                        return pos
                    }, sel_move);
                },
                goLineUp: function (cm) {
                    return cm.moveV(-1, "line");
                },
                goLineDown: function (cm) {
                    return cm.moveV(1, "line");
                },
                goPageUp: function (cm) {
                    return cm.moveV(-1, "page");
                },
                goPageDown: function (cm) {
                    return cm.moveV(1, "page");
                },
                goCharLeft: function (cm) {
                    return cm.moveH(-1, "char");
                },
                goCharRight: function (cm) {
                    return cm.moveH(1, "char");
                },
                goColumnLeft: function (cm) {
                    return cm.moveH(-1, "column");
                },
                goColumnRight: function (cm) {
                    return cm.moveH(1, "column");
                },
                goWordLeft: function (cm) {
                    return cm.moveH(-1, "word");
                },
                goGroupRight: function (cm) {
                    return cm.moveH(1, "group");
                },
                goGroupLeft: function (cm) {
                    return cm.moveH(-1, "group");
                },
                goWordRight: function (cm) {
                    return cm.moveH(1, "word");
                },
                delCharBefore: function (cm) {
                    return cm.deleteH(-1, "char");
                },
                delCharAfter: function (cm) {
                    return cm.deleteH(1, "char");
                },
                delWordBefore: function (cm) {
                    return cm.deleteH(-1, "word");
                },
                delWordAfter: function (cm) {
                    return cm.deleteH(1, "word");
                },
                delGroupBefore: function (cm) {
                    return cm.deleteH(-1, "group");
                },
                delGroupAfter: function (cm) {
                    return cm.deleteH(1, "group");
                },
                indentAuto: function (cm) {
                    return cm.indentSelection("smart");
                },
                indentMore: function (cm) {
                    return cm.indentSelection("add");
                },
                indentLess: function (cm) {
                    return cm.indentSelection("subtract");
                },
                insertTab: function (cm) {
                    return cm.replaceSelection("\t");
                },
                insertSoftTab: function (cm) {
                    var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
                    for (var i = 0; i < ranges.length; i++) {
                        var pos = ranges[i].from();
                        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
                        spaces.push(spaceStr(tabSize - col % tabSize));
                    }
                    cm.replaceSelections(spaces);
                },
                defaultTab: function (cm) {
                    if (cm.somethingSelected()) {
                        cm.indentSelection("add");
                    } else {
                        cm.execCommand("insertTab");
                    }
                },
                // Swap the two chars left and right of each selection's head.
                // Move cursor behind the two swapped characters afterwards.
                //
                // Doesn't consider line feeds a character.
                // Doesn't scan more than one line above to find a character.
                // Doesn't do anything on an empty line.
                // Doesn't do anything with non-empty selections.
                transposeChars: function (cm) {
                    return runInOp(cm, function () {
                        var ranges = cm.listSelections(), newSel = [];
                        for (var i = 0; i < ranges.length; i++) {
                            if (!ranges[i].empty()) {
                                continue
                            }
                            var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
                            if (line) {
                                if (cur.ch == line.length) {
                                    cur = new Pos(cur.line, cur.ch - 1);
                                }
                                if (cur.ch > 0) {
                                    cur = new Pos(cur.line, cur.ch + 1);
                                    cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                                        Pos(cur.line, cur.ch - 2), cur, "+transpose");
                                } else if (cur.line > cm.doc.first) {
                                    var prev = getLine(cm.doc, cur.line - 1).text;
                                    if (prev) {
                                        cur = new Pos(cur.line, 1);
                                        cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
                                            prev.charAt(prev.length - 1),
                                            Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
                                    }
                                }
                            }
                            newSel.push(new Range(cur, cur));
                        }
                        cm.setSelections(newSel);
                    });
                },
                newlineAndIndent: function (cm) {
                    return runInOp(cm, function () {
                        var sels = cm.listSelections();
                        for (var i = sels.length - 1; i >= 0; i--) {
                            cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input");
                        }
                        sels = cm.listSelections();
                        for (var i$1 = 0; i$1 < sels.length; i$1++) {
                            cm.indentLine(sels[i$1].from().line, null, true);
                        }
                        ensureCursorVisible(cm);
                    });
                },
                openLine: function (cm) {
                    return cm.replaceSelection("\n", "start");
                },
                toggleOverwrite: function (cm) {
                    return cm.toggleOverwrite();
                }
            };


            function lineStart(cm, lineN) {
                var line = getLine(cm.doc, lineN);
                var visual = visualLine(line);
                if (visual != line) {
                    lineN = lineNo(visual);
                }
                return endOfLine(true, cm, visual, lineN, 1)
            }

            function lineEnd(cm, lineN) {
                var line = getLine(cm.doc, lineN);
                var visual = visualLineEnd(line);
                if (visual != line) {
                    lineN = lineNo(visual);
                }
                return endOfLine(true, cm, line, lineN, -1)
            }

            function lineStartSmart(cm, pos) {
                var start = lineStart(cm, pos.line);
                var line = getLine(cm.doc, start.line);
                var order = getOrder(line, cm.doc.direction);
                if (!order || order[0].level == 0) {
                    var firstNonWS = Math.max(0, line.text.search(/\S/));
                    var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
                    return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
                }
                return start
            }

            // Run a handler that was bound to a key.
            function doHandleBinding(cm, bound, dropShift) {
                if (typeof bound == "string") {
                    bound = commands[bound];
                    if (!bound) {
                        return false
                    }
                }
                // Ensure previous input has been read, so that the handler sees a
                // consistent view of the document
                cm.display.input.ensurePolled();
                var prevShift = cm.display.shift, done = false;
                try {
                    if (cm.isReadOnly()) {
                        cm.state.suppressEdits = true;
                    }
                    if (dropShift) {
                        cm.display.shift = false;
                    }
                    done = bound(cm) != Pass;
                } finally {
                    cm.display.shift = prevShift;
                    cm.state.suppressEdits = false;
                }
                return done
            }

            function lookupKeyForEditor(cm, name, handle) {
                for (var i = 0; i < cm.state.keyMaps.length; i++) {
                    var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
                    if (result) {
                        return result
                    }
                }
                return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
                    || lookupKey(name, cm.options.keyMap, handle, cm)
            }

            // Note that, despite the name, this function is also used to check
            // for bound mouse clicks.

            var stopSeq = new Delayed;

            function dispatchKey(cm, name, e, handle) {
                var seq = cm.state.keySeq;
                if (seq) {
                    if (isModifierKey(name)) {
                        return "handled"
                    }
                    if (/\'$/.test(name)) {
                        cm.state.keySeq = null;
                    } else {
                        stopSeq.set(50, function () {
                            if (cm.state.keySeq == seq) {
                                cm.state.keySeq = null;
                                cm.display.input.reset();
                            }
                        });
                    }
                    if (dispatchKeyInner(cm, seq + " " + name, e, handle)) {
                        return true
                    }
                }
                return dispatchKeyInner(cm, name, e, handle)
            }

            function dispatchKeyInner(cm, name, e, handle) {
                var result = lookupKeyForEditor(cm, name, handle);

                if (result == "multi") {
                    cm.state.keySeq = name;
                }
                if (result == "handled") {
                    signalLater(cm, "keyHandled", cm, name, e);
                }

                if (result == "handled" || result == "multi") {
                    e_preventDefault(e);
                    restartBlink(cm);
                }

                return !!result
            }

            // Handle a key from the keydown event.
            function handleKeyBinding(cm, e) {
                var name = keyName(e, true);
                if (!name) {
                    return false
                }

                if (e.shiftKey && !cm.state.keySeq) {
                    // First try to resolve full name (including 'Shift-'). Failing
                    // that, see if there is a cursor-motion command (starting with
                    // 'go') bound to the keyname without 'Shift-'.
                    return dispatchKey(cm, "Shift-" + name, e, function (b) {
                            return doHandleBinding(cm, b, true);
                        })
                        || dispatchKey(cm, name, e, function (b) {
                            if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion) {
                                return doHandleBinding(cm, b)
                            }
                        })
                } else {
                    return dispatchKey(cm, name, e, function (b) {
                        return doHandleBinding(cm, b);
                    })
                }
            }

            // Handle a key from the keypress event
            function handleCharBinding(cm, e, ch) {
                return dispatchKey(cm, "'" + ch + "'", e, function (b) {
                    return doHandleBinding(cm, b, true);
                })
            }

            var lastStoppedKey = null;

            function onKeyDown(e) {
                var cm = this;
                cm.curOp.focus = activeElt();
                if (signalDOMEvent(cm, e)) {
                    return
                }
                // IE does strange things with escape.
                if (ie && ie_version < 11 && e.keyCode == 27) {
                    e.returnValue = false;
                }
                var code = e.keyCode;
                cm.display.shift = code == 16 || e.shiftKey;
                var handled = handleKeyBinding(cm, e);
                if (presto) {
                    lastStoppedKey = handled ? code : null;
                    // Opera has no cut event... we try to at least catch the key combo
                    if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey)) {
                        cm.replaceSelection("", null, "cut");
                    }
                }

                // Turn mouse into crosshair when Alt is held on Mac.
                if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className)) {
                    showCrossHair(cm);
                }
            }

            function showCrossHair(cm) {
                var lineDiv = cm.display.lineDiv;
                addClass(lineDiv, "CodeMirror-crosshair");

                function up(e) {
                    if (e.keyCode == 18 || !e.altKey) {
                        rmClass(lineDiv, "CodeMirror-crosshair");
                        off(document, "keyup", up);
                        off(document, "mouseover", up);
                    }
                }

                on(document, "keyup", up);
                on(document, "mouseover", up);
            }

            function onKeyUp(e) {
                if (e.keyCode == 16) {
                    this.doc.sel.shift = false;
                }
                signalDOMEvent(this, e);
            }

            function onKeyPress(e) {
                var cm = this;
                if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) {
                    return
                }
                var keyCode = e.keyCode, charCode = e.charCode;
                if (presto && keyCode == lastStoppedKey) {
                    lastStoppedKey = null;
                    e_preventDefault(e);
                    return
                }
                if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) {
                    return
                }
                var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
                // Some browsers fire keypress events for backspace
                if (ch == "\x08") {
                    return
                }
                if (handleCharBinding(cm, e, ch)) {
                    return
                }
                cm.display.input.onKeyPress(e);
            }

            var DOUBLECLICK_DELAY = 400;

            var PastClick = function (time, pos, button) {
                this.time = time;
                this.pos = pos;
                this.button = button;
            };

            PastClick.prototype.compare = function (time, pos, button) {
                return this.time + DOUBLECLICK_DELAY > time &&
                    cmp(pos, this.pos) == 0 && button == this.button
            };

            var lastClick, lastDoubleClick;

            function clickRepeat(pos, button) {
                var now = +new Date;
                if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
                    lastClick = lastDoubleClick = null;
                    return "triple"
                } else if (lastClick && lastClick.compare(now, pos, button)) {
                    lastDoubleClick = new PastClick(now, pos, button);
                    lastClick = null;
                    return "double"
                } else {
                    lastClick = new PastClick(now, pos, button);
                    lastDoubleClick = null;
                    return "single"
                }
            }

            // A mouse down can be a single click, double click, triple click,
            // start of selection drag, start of text drag, new cursor
            // (ctrl-click), rectangle drag (alt-drag), or xwin
            // middle-click-paste. Or it might be a click on something we should
            // not interfere with, such as a scrollbar or widget.
            function onMouseDown(e) {
                var cm = this, display = cm.display;
                if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) {
                    return
                }
                display.input.ensurePolled();
                display.shift = e.shiftKey;

                if (eventInWidget(display, e)) {
                    if (!webkit) {
                        // Briefly turn off draggability, to allow widgets to do
                        // normal dragging things.
                        display.scroller.draggable = false;
                        setTimeout(function () {
                            return display.scroller.draggable = true;
                        }, 100);
                    }
                    return
                }
                if (clickInGutter(cm, e)) {
                    return
                }
                var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single";
                window.focus();

                // #3261: make sure, that we're not starting a second selection
                if (button == 1 && cm.state.selectingText) {
                    cm.state.selectingText(e);
                }

                if (pos && handleMappedButton(cm, button, pos, repeat, e)) {
                    return
                }

                if (button == 1) {
                    if (pos) {
                        leftButtonDown(cm, pos, repeat, e);
                    } else if (e_target(e) == display.scroller) {
                        e_preventDefault(e);
                    }
                } else if (button == 2) {
                    if (pos) {
                        extendSelection(cm.doc, pos);
                    }
                    setTimeout(function () {
                        return display.input.focus();
                    }, 20);
                } else if (button == 3) {
                    if (captureRightClick) {
                        cm.display.input.onContextMenu(e);
                    } else {
                        delayBlurEvent(cm);
                    }
                }
            }

            function handleMappedButton(cm, button, pos, repeat, event) {
                var name = "Click";
                if (repeat == "double") {
                    name = "Double" + name;
                } else if (repeat == "triple") {
                    name = "Triple" + name;
                }
                name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;

                return dispatchKey(cm, addModifierNames(name, event), event, function (bound) {
                    if (typeof bound == "string") {
                        bound = commands[bound];
                    }
                    if (!bound) {
                        return false
                    }
                    var done = false;
                    try {
                        if (cm.isReadOnly()) {
                            cm.state.suppressEdits = true;
                        }
                        done = bound(cm, pos) != Pass;
                    } finally {
                        cm.state.suppressEdits = false;
                    }
                    return done
                })
            }

            function configureMouse(cm, repeat, event) {
                var option = cm.getOption("configureMouse");
                var value = option ? option(cm, repeat, event) : {};
                if (value.unit == null) {
                    var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
                    value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
                }
                if (value.extend == null || cm.doc.extend) {
                    value.extend = cm.doc.extend || event.shiftKey;
                }
                if (value.addNew == null) {
                    value.addNew = mac ? event.metaKey : event.ctrlKey;
                }
                if (value.moveOnDrag == null) {
                    value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey);
                }
                return value
            }

            function leftButtonDown(cm, pos, repeat, event) {
                if (ie) {
                    setTimeout(bind(ensureFocus, cm), 0);
                } else {
                    cm.curOp.focus = activeElt();
                }

                var behavior = configureMouse(cm, repeat, event);

                var sel = cm.doc.sel, contained;
                if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
                    repeat == "single" && (contained = sel.contains(pos)) > -1 &&
                    (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
                    (cmp(contained.to(), pos) > 0 || pos.xRel < 0)) {
                    leftButtonStartDrag(cm, event, pos, behavior);
                } else {
                    leftButtonSelect(cm, event, pos, behavior);
                }
            }

            // Start a text drag. When it ends, see if any dragging actually
            // happen, and treat as a click if it didn't.
            function leftButtonStartDrag(cm, event, pos, behavior) {
                var display = cm.display, moved = false;
                var dragEnd = operation(cm, function (e) {
                    if (webkit) {
                        display.scroller.draggable = false;
                    }
                    cm.state.draggingText = false;
                    off(display.wrapper.ownerDocument, "mouseup", dragEnd);
                    off(display.wrapper.ownerDocument, "mousemove", mouseMove);
                    off(display.scroller, "dragstart", dragStart);
                    off(display.scroller, "drop", dragEnd);
                    if (!moved) {
                        e_preventDefault(e);
                        if (!behavior.addNew) {
                            extendSelection(cm.doc, pos, null, null, behavior.extend);
                        }
                        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
                        if (webkit || ie && ie_version == 9) {
                            setTimeout(function () {
                                display.wrapper.ownerDocument.body.focus();
                                display.input.focus();
                            }, 20);
                        } else {
                            display.input.focus();
                        }
                    }
                });
                var mouseMove = function (e2) {
                    moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
                };
                var dragStart = function () {
                    return moved = true;
                };
                // Let the drag handler handle this.
                if (webkit) {
                    display.scroller.draggable = true;
                }
                cm.state.draggingText = dragEnd;
                dragEnd.copy = !behavior.moveOnDrag;
                // IE's approach to draggable
                if (display.scroller.dragDrop) {
                    display.scroller.dragDrop();
                }
                on(display.wrapper.ownerDocument, "mouseup", dragEnd);
                on(display.wrapper.ownerDocument, "mousemove", mouseMove);
                on(display.scroller, "dragstart", dragStart);
                on(display.scroller, "drop", dragEnd);

                delayBlurEvent(cm);
                setTimeout(function () {
                    return display.input.focus();
                }, 20);
            }

            function rangeForUnit(cm, pos, unit) {
                if (unit == "char") {
                    return new Range(pos, pos)
                }
                if (unit == "word") {
                    return cm.findWordAt(pos)
                }
                if (unit == "line") {
                    return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)))
                }
                var result = unit(cm, pos);
                return new Range(result.from, result.to)
            }

            // Normal selection, as opposed to text dragging.
            function leftButtonSelect(cm, event, start, behavior) {
                var display = cm.display, doc = cm.doc;
                e_preventDefault(event);

                var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
                if (behavior.addNew && !behavior.extend) {
                    ourIndex = doc.sel.contains(start);
                    if (ourIndex > -1) {
                        ourRange = ranges[ourIndex];
                    } else {
                        ourRange = new Range(start, start);
                    }
                } else {
                    ourRange = doc.sel.primary();
                    ourIndex = doc.sel.primIndex;
                }

                if (behavior.unit == "rectangle") {
                    if (!behavior.addNew) {
                        ourRange = new Range(start, start);
                    }
                    start = posFromMouse(cm, event, true, true);
                    ourIndex = -1;
                } else {
                    var range$$1 = rangeForUnit(cm, start, behavior.unit);
                    if (behavior.extend) {
                        ourRange = extendRange(ourRange, range$$1.anchor, range$$1.head, behavior.extend);
                    } else {
                        ourRange = range$$1;
                    }
                }

                if (!behavior.addNew) {
                    ourIndex = 0;
                    setSelection(doc, new Selection([ourRange], 0), sel_mouse);
                    startSel = doc.sel;
                } else if (ourIndex == -1) {
                    ourIndex = ranges.length;
                    setSelection(doc, normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),
                        {scroll: false, origin: "*mouse"});
                } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
                    setSelection(doc, normalizeSelection(cm, ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
                        {scroll: false, origin: "*mouse"});
                    startSel = doc.sel;
                } else {
                    replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
                }

                var lastPos = start;

                function extendTo(pos) {
                    if (cmp(lastPos, pos) == 0) {
                        return
                    }
                    lastPos = pos;

                    if (behavior.unit == "rectangle") {
                        var ranges = [], tabSize = cm.options.tabSize;
                        var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
                        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
                        var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
                        for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
                             line <= end; line++) {
                            var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
                            if (left == right) {
                                ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)));
                            } else if (text.length > leftPos) {
                                ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))));
                            }
                        }
                        if (!ranges.length) {
                            ranges.push(new Range(start, start));
                        }
                        setSelection(doc, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
                            {origin: "*mouse", scroll: false});
                        cm.scrollIntoView(pos);
                    } else {
                        var oldRange = ourRange;
                        var range$$1 = rangeForUnit(cm, pos, behavior.unit);
                        var anchor = oldRange.anchor, head;
                        if (cmp(range$$1.anchor, anchor) > 0) {
                            head = range$$1.head;
                            anchor = minPos(oldRange.from(), range$$1.anchor);
                        } else {
                            head = range$$1.anchor;
                            anchor = maxPos(oldRange.to(), range$$1.head);
                        }
                        var ranges$1 = startSel.ranges.slice(0);
                        ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));
                        setSelection(doc, normalizeSelection(cm, ranges$1, ourIndex), sel_mouse);
                    }
                }

                var editorSize = display.wrapper.getBoundingClientRect();
                // Used to ensure timeout re-tries don't fire when another extend
                // happened in the meantime (clearTimeout isn't reliable -- at
                // least on Chrome, the timeouts still happen even when cleared,
                // if the clear happens after their scheduled firing time).
                var counter = 0;

                function extend(e) {
                    var curCount = ++counter;
                    var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
                    if (!cur) {
                        return
                    }
                    if (cmp(cur, lastPos) != 0) {
                        cm.curOp.focus = activeElt();
                        extendTo(cur);
                        var visible = visibleLines(display, doc);
                        if (cur.line >= visible.to || cur.line < visible.from) {
                            setTimeout(operation(cm, function () {
                                if (counter == curCount) {
                                    extend(e);
                                }
                            }), 150);
                        }
                    } else {
                        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
                        if (outside) {
                            setTimeout(operation(cm, function () {
                                if (counter != curCount) {
                                    return
                                }
                                display.scroller.scrollTop += outside;
                                extend(e);
                            }), 50);
                        }
                    }
                }

                function done(e) {
                    cm.state.selectingText = false;
                    counter = Infinity;
                    e_preventDefault(e);
                    display.input.focus();
                    off(display.wrapper.ownerDocument, "mousemove", move);
                    off(display.wrapper.ownerDocument, "mouseup", up);
                    doc.history.lastSelOrigin = null;
                }

                var move = operation(cm, function (e) {
                    if (e.buttons === 0 || !e_button(e)) {
                        done(e);
                    } else {
                        extend(e);
                    }
                });
                var up = operation(cm, done);
                cm.state.selectingText = up;
                on(display.wrapper.ownerDocument, "mousemove", move);
                on(display.wrapper.ownerDocument, "mouseup", up);
            }

            // Used when mouse-selecting to adjust the anchor to the proper side
            // of a bidi jump depending on the visual position of the head.
            function bidiSimplify(cm, range$$1) {
                var anchor = range$$1.anchor;
                var head = range$$1.head;
                var anchorLine = getLine(cm.doc, anchor.line);
                if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) {
                    return range$$1
                }
                var order = getOrder(anchorLine);
                if (!order) {
                    return range$$1
                }
                var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index];
                if (part.from != anchor.ch && part.to != anchor.ch) {
                    return range$$1
                }
                var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
                if (boundary == 0 || boundary == order.length) {
                    return range$$1
                }

                // Compute the relative visual position of the head compared to the
                // anchor (<0 is to the left, >0 to the right)
                var leftSide;
                if (head.line != anchor.line) {
                    leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
                } else {
                    var headIndex = getBidiPartAt(order, head.ch, head.sticky);
                    var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
                    if (headIndex == boundary - 1 || headIndex == boundary) {
                        leftSide = dir < 0;
                    } else {
                        leftSide = dir > 0;
                    }
                }

                var usePart = order[boundary + (leftSide ? -1 : 0)];
                var from = leftSide == (usePart.level == 1);
                var ch = from ? usePart.from : usePart.to, sticky = from ? "after" : "before";
                return anchor.ch == ch && anchor.sticky == sticky ? range$$1 : new Range(new Pos(anchor.line, ch, sticky), head)
            }


            // Determines whether an event happened in the gutter, and fires the
            // handlers for the corresponding event.
            function gutterEvent(cm, e, type, prevent) {
                var mX, mY;
                if (e.touches) {
                    mX = e.touches[0].clientX;
                    mY = e.touches[0].clientY;
                } else {
                    try {
                        mX = e.clientX;
                        mY = e.clientY;
                    } catch (e) {
                        return false
                    }
                }
                if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) {
                    return false
                }
                if (prevent) {
                    e_preventDefault(e);
                }

                var display = cm.display;
                var lineBox = display.lineDiv.getBoundingClientRect();

                if (mY > lineBox.bottom || !hasHandler(cm, type)) {
                    return e_defaultPrevented(e)
                }
                mY -= lineBox.top - display.viewOffset;

                for (var i = 0; i < cm.options.gutters.length; ++i) {
                    var g = display.gutters.childNodes[i];
                    if (g && g.getBoundingClientRect().right >= mX) {
                        var line = lineAtHeight(cm.doc, mY);
                        var gutter = cm.options.gutters[i];
                        signal(cm, type, cm, line, gutter, e);
                        return e_defaultPrevented(e)
                    }
                }
            }

            function clickInGutter(cm, e) {
                return gutterEvent(cm, e, "gutterClick", true)
            }

            // CONTEXT MENU HANDLING

            // To make the context menu work, we need to briefly unhide the
            // textarea (making it as unobtrusive as possible) to let the
            // right-click take effect on it.
            function onContextMenu(cm, e) {
                if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) {
                    return
                }
                if (signalDOMEvent(cm, e, "contextmenu")) {
                    return
                }
                if (!captureRightClick) {
                    cm.display.input.onContextMenu(e);
                }
            }

            function contextMenuInGutter(cm, e) {
                if (!hasHandler(cm, "gutterContextMenu")) {
                    return false
                }
                return gutterEvent(cm, e, "gutterContextMenu", false)
            }

            function themeChanged(cm) {
                cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
                    cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
                clearCaches(cm);
            }

            var Init = {
                toString: function () {
                    return "CodeMirror.Init"
                }
            };

            var defaults = {};
            var optionHandlers = {};

            function defineOptions(CodeMirror) {
                var optionHandlers = CodeMirror.optionHandlers;

                function option(name, deflt, handle, notOnInit) {
                    CodeMirror.defaults[name] = deflt;
                    if (handle) {
                        optionHandlers[name] =
                            notOnInit ? function (cm, val, old) {
                                if (old != Init) {
                                    handle(cm, val, old);
                                }
                            } : handle;
                    }
                }

                CodeMirror.defineOption = option;

                // Passed to option handlers when there is no old value.
                CodeMirror.Init = Init;

                // These two are, on init, called from the constructor because they
                // have to be initialized before the editor can start at all.
                option("value", "", function (cm, val) {
                    return cm.setValue(val);
                }, true);
                option("mode", null, function (cm, val) {
                    cm.doc.modeOption = val;
                    loadMode(cm);
                }, true);

                option("indentUnit", 2, loadMode, true);
                option("indentWithTabs", false);
                option("smartIndent", true);
                option("tabSize", 4, function (cm) {
                    resetModeState(cm);
                    clearCaches(cm);
                    regChange(cm);
                }, true);

                option("lineSeparator", null, function (cm, val) {
                    cm.doc.lineSep = val;
                    if (!val) {
                        return
                    }
                    var newBreaks = [], lineNo = cm.doc.first;
                    cm.doc.iter(function (line) {
                        for (var pos = 0; ;) {
                            var found = line.text.indexOf(val, pos);
                            if (found == -1) {
                                break
                            }
                            pos = found + val.length;
                            newBreaks.push(Pos(lineNo, found));
                        }
                        lineNo++;
                    });
                    for (var i = newBreaks.length - 1; i >= 0; i--) {
                        replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length));
                    }
                });
                option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff]/g, function (cm, val, old) {
                    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
                    if (old != Init) {
                        cm.refresh();
                    }
                });
                option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) {
                    return cm.refresh();
                }, true);
                option("electricChars", true);
                option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
                    throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
                }, true);
                option("spellcheck", false, function (cm, val) {
                    return cm.getInputField().spellcheck = val;
                }, true);
                option("rtlMoveVisually", !windows);
                option("wholeLineUpdateBefore", true);

                option("theme", "default", function (cm) {
                    themeChanged(cm);
                    guttersChanged(cm);
                }, true);
                option("keyMap", "default", function (cm, val, old) {
                    var next = getKeyMap(val);
                    var prev = old != Init && getKeyMap(old);
                    if (prev && prev.detach) {
                        prev.detach(cm, next);
                    }
                    if (next.attach) {
                        next.attach(cm, prev || null);
                    }
                });
                option("extraKeys", null);
                option("configureMouse", null);

                option("lineWrapping", false, wrappingChanged, true);
                option("gutters", [], function (cm) {
                    setGuttersForLineNumbers(cm.options);
                    guttersChanged(cm);
                }, true);
                option("fixedGutter", true, function (cm, val) {
                    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
                    cm.refresh();
                }, true);
                option("coverGutterNextToScrollbar", false, function (cm) {
                    return updateScrollbars(cm);
                }, true);
                option("scrollbarStyle", "native", function (cm) {
                    initScrollbars(cm);
                    updateScrollbars(cm);
                    cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
                    cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
                }, true);
                option("lineNumbers", false, function (cm) {
                    setGuttersForLineNumbers(cm.options);
                    guttersChanged(cm);
                }, true);
                option("firstLineNumber", 1, guttersChanged, true);
                option("lineNumberFormatter", function (integer) {
                    return integer;
                }, guttersChanged, true);
                option("showCursorWhenSelecting", false, updateSelection, true);

                option("resetSelectionOnContextMenu", true);
                option("lineWiseCopyCut", true);
                option("pasteLinesPerSelection", true);
                option("selectionsMayTouch", false);

                option("readOnly", false, function (cm, val) {
                    if (val == "nocursor") {
                        onBlur(cm);
                        cm.display.input.blur();
                    }
                    cm.display.input.readOnlyChanged(val);
                });
                option("disableInput", false, function (cm, val) {
                    if (!val) {
                        cm.display.input.reset();
                    }
                }, true);
                option("dragDrop", true, dragDropChanged);
                option("allowDropFileTypes", null);

                option("cursorBlinkRate", 530);
                option("cursorScrollMargin", 0);
                option("cursorHeight", 1, updateSelection, true);
                option("singleCursorHeightPerLine", true, updateSelection, true);
                option("workTime", 100);
                option("workDelay", 100);
                option("flattenSpans", true, resetModeState, true);
                option("addModeClass", false, resetModeState, true);
                option("pollInterval", 100);
                option("undoDepth", 200, function (cm, val) {
                    return cm.doc.history.undoDepth = val;
                });
                option("historyEventDelay", 1250);
                option("viewportMargin", 10, function (cm) {
                    return cm.refresh();
                }, true);
                option("maxHighlightLength", 10000, resetModeState, true);
                option("moveInputWithCursor", true, function (cm, val) {
                    if (!val) {
                        cm.display.input.resetPosition();
                    }
                });

                option("tabindex", null, function (cm, val) {
                    return cm.display.input.getField().tabIndex = val || "";
                });
                option("autofocus", null);
                option("direction", "ltr", function (cm, val) {
                    return cm.doc.setDirection(val);
                }, true);
                option("phrases", null);
            }

            function guttersChanged(cm) {
                updateGutters(cm);
                regChange(cm);
                alignHorizontally(cm);
            }

            function dragDropChanged(cm, value, old) {
                var wasOn = old && old != Init;
                if (!value != !wasOn) {
                    var funcs = cm.display.dragFunctions;
                    var toggle = value ? on : off;
                    toggle(cm.display.scroller, "dragstart", funcs.start);
                    toggle(cm.display.scroller, "dragenter", funcs.enter);
                    toggle(cm.display.scroller, "dragover", funcs.over);
                    toggle(cm.display.scroller, "dragleave", funcs.leave);
                    toggle(cm.display.scroller, "drop", funcs.drop);
                }
            }

            function wrappingChanged(cm) {
                if (cm.options.lineWrapping) {
                    addClass(cm.display.wrapper, "CodeMirror-wrap");
                    cm.display.sizer.style.minWidth = "";
                    cm.display.sizerWidth = null;
                } else {
                    rmClass(cm.display.wrapper, "CodeMirror-wrap");
                    findMaxLine(cm);
                }
                estimateLineHeights(cm);
                regChange(cm);
                clearCaches(cm);
                setTimeout(function () {
                    return updateScrollbars(cm);
                }, 100);
            }

            // A CodeMirror instance represents an editor. This is the object
            // that user code is usually dealing with.

            function CodeMirror(place, options) {
                var this$1 = this;

                if (!(this instanceof CodeMirror)) {
                    return new CodeMirror(place, options)
                }

                this.options = options = options ? copyObj(options) : {};
                // Determine effective options based on given values and defaults.
                copyObj(defaults, options, false);
                setGuttersForLineNumbers(options);

                var doc = options.value;
                if (typeof doc == "string") {
                    doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction);
                } else if (options.mode) {
                    doc.modeOption = options.mode;
                }
                this.doc = doc;

                var input = new CodeMirror.inputStyles[options.inputStyle](this);
                var display = this.display = new Display(place, doc, input);
                display.wrapper.CodeMirror = this;
                updateGutters(this);
                themeChanged(this);
                if (options.lineWrapping) {
                    this.display.wrapper.className += " CodeMirror-wrap";
                }
                initScrollbars(this);

                this.state = {
                    keyMaps: [],  // stores maps added by addKeyMap
                    overlays: [], // highlighting overlays, as added by addOverlay
                    modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
                    overwrite: false,
                    delayingBlurEvent: false,
                    focused: false,
                    suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
                    pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
                    selectingText: false,
                    draggingText: false,
                    highlight: new Delayed(), // stores highlight worker timeout
                    keySeq: null,  // Unfinished key sequence
                    specialChars: null
                };

                if (options.autofocus && !mobile) {
                    display.input.focus();
                }

                // Override magic textarea content restore that IE sometimes does
                // on our hidden textarea on reload
                if (ie && ie_version < 11) {
                    setTimeout(function () {
                        return this$1.display.input.reset(true);
                    }, 20);
                }

                registerEventHandlers(this);
                ensureGlobalHandlers();

                startOperation(this);
                this.curOp.forceUpdate = true;
                attachDoc(this, doc);

                if ((options.autofocus && !mobile) || this.hasFocus()) {
                    setTimeout(bind(onFocus, this), 20);
                } else {
                    onBlur(this);
                }

                for (var opt in optionHandlers) {
                    if (optionHandlers.hasOwnProperty(opt)) {
                        optionHandlers[opt](this$1, options[opt], Init);
                    }
                }
                maybeUpdateLineNumberWidth(this);
                if (options.finishInit) {
                    options.finishInit(this);
                }
                for (var i = 0; i < initHooks.length; ++i) {
                    initHooks[i](this$1);
                }
                endOperation(this);
                // Suppress optimizelegibility in Webkit, since it breaks text
                // measuring on line wrapping boundaries.
                if (webkit && options.lineWrapping &&
                    getComputedStyle(display.lineDiv).textRendering == "optimizelegibility") {
                    display.lineDiv.style.textRendering = "auto";
                }
            }

            // The default configuration options.
            CodeMirror.defaults = defaults;
            // Functions to run when options are changed.
            CodeMirror.optionHandlers = optionHandlers;

            // Attach the necessary event handlers when initializing the editor
            function registerEventHandlers(cm) {
                var d = cm.display;
                on(d.scroller, "mousedown", operation(cm, onMouseDown));
                // Older IE's will not fire a second mousedown for a double click
                if (ie && ie_version < 11) {
                    on(d.scroller, "dblclick", operation(cm, function (e) {
                        if (signalDOMEvent(cm, e)) {
                            return
                        }
                        var pos = posFromMouse(cm, e);
                        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) {
                            return
                        }
                        e_preventDefault(e);
                        var word = cm.findWordAt(pos);
                        extendSelection(cm.doc, word.anchor, word.head);
                    }));
                } else {
                    on(d.scroller, "dblclick", function (e) {
                        return signalDOMEvent(cm, e) || e_preventDefault(e);
                    });
                }
                // Some browsers fire contextmenu *after* opening the menu, at
                // which point we can't mess with it anymore. Context menu is
                // handled in onMouseDown for these browsers.
                on(d.scroller, "contextmenu", function (e) {
                    return onContextMenu(cm, e);
                });

                // Used to suppress mouse event handling when a touch happens
                var touchFinished, prevTouch = {end: 0};

                function finishTouch() {
                    if (d.activeTouch) {
                        touchFinished = setTimeout(function () {
                            return d.activeTouch = null;
                        }, 1000);
                        prevTouch = d.activeTouch;
                        prevTouch.end = +new Date;
                    }
                }

                function isMouseLikeTouchEvent(e) {
                    if (e.touches.length != 1) {
                        return false
                    }
                    var touch = e.touches[0];
                    return touch.radiusX <= 1 && touch.radiusY <= 1
                }

                function farAway(touch, other) {
                    if (other.left == null) {
                        return true
                    }
                    var dx = other.left - touch.left, dy = other.top - touch.top;
                    return dx * dx + dy * dy > 20 * 20
                }

                on(d.scroller, "touchstart", function (e) {
                    if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
                        d.input.ensurePolled();
                        clearTimeout(touchFinished);
                        var now = +new Date;
                        d.activeTouch = {
                            start: now, moved: false,
                            prev: now - prevTouch.end <= 300 ? prevTouch : null
                        };
                        if (e.touches.length == 1) {
                            d.activeTouch.left = e.touches[0].pageX;
                            d.activeTouch.top = e.touches[0].pageY;
                        }
                    }
                });
                on(d.scroller, "touchmove", function () {
                    if (d.activeTouch) {
                        d.activeTouch.moved = true;
                    }
                });
                on(d.scroller, "touchend", function (e) {
                    var touch = d.activeTouch;
                    if (touch && !eventInWidget(d, e) && touch.left != null &&
                        !touch.moved && new Date - touch.start < 300) {
                        var pos = cm.coordsChar(d.activeTouch, "page"), range;
                        if (!touch.prev || farAway(touch, touch.prev)) // Single tap
                        {
                            range = new Range(pos, pos);
                        } else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
                        {
                            range = cm.findWordAt(pos);
                        } else // Triple tap
                        {
                            range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0)));
                        }
                        cm.setSelection(range.anchor, range.head);
                        cm.focus();
                        e_preventDefault(e);
                    }
                    finishTouch();
                });
                on(d.scroller, "touchcancel", finishTouch);

                // Sync scrolling between fake scrollbars and real scrollable
                // area, ensure viewport is updated when scrolling.
                on(d.scroller, "scroll", function () {
                    if (d.scroller.clientHeight) {
                        updateScrollTop(cm, d.scroller.scrollTop);
                        setScrollLeft(cm, d.scroller.scrollLeft, true);
                        signal(cm, "scroll", cm);
                    }
                });

                // Listen to wheel events in order to try and update the viewport on time.
                on(d.scroller, "mousewheel", function (e) {
                    return onScrollWheel(cm, e);
                });
                on(d.scroller, "DOMMouseScroll", function (e) {
                    return onScrollWheel(cm, e);
                });

                // Prevent wrapper from ever scrolling
                on(d.wrapper, "scroll", function () {
                    return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0;
                });

                d.dragFunctions = {
                    enter: function (e) {
                        if (!signalDOMEvent(cm, e)) {
                            e_stop(e);
                        }
                    },
                    over: function (e) {
                        if (!signalDOMEvent(cm, e)) {
                            onDragOver(cm, e);
                            e_stop(e);
                        }
                    },
                    start: function (e) {
                        return onDragStart(cm, e);
                    },
                    drop: operation(cm, onDrop),
                    leave: function (e) {
                        if (!signalDOMEvent(cm, e)) {
                            clearDragCursor(cm);
                        }
                    }
                };

                var inp = d.input.getField();
                on(inp, "keyup", function (e) {
                    return onKeyUp.call(cm, e);
                });
                on(inp, "keydown", operation(cm, onKeyDown));
                on(inp, "keypress", operation(cm, onKeyPress));
                on(inp, "focus", function (e) {
                    return onFocus(cm, e);
                });
                on(inp, "blur", function (e) {
                    return onBlur(cm, e);
                });
            }

            var initHooks = [];
            CodeMirror.defineInitHook = function (f) {
                return initHooks.push(f);
            };

            // Indent the given line. The how parameter can be "smart",
            // "add"/null, "subtract", or "prev". When aggressive is false
            // (typically set to true for forced single-line indents), empty
            // lines are not indented, and places where the mode returns Pass
            // are left alone.
            function indentLine(cm, n, how, aggressive) {
                var doc = cm.doc, state;
                if (how == null) {
                    how = "add";
                }
                if (how == "smart") {
                    // Fall back to "prev" when the mode doesn't have an indentation
                    // method.
                    if (!doc.mode.indent) {
                        how = "prev";
                    } else {
                        state = getContextBefore(cm, n).state;
                    }
                }

                var tabSize = cm.options.tabSize;
                var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
                if (line.stateAfter) {
                    line.stateAfter = null;
                }
                var curSpaceString = line.text.match(/^\s*/)[0], indentation;
                if (!aggressive && !/\S/.test(line.text)) {
                    indentation = 0;
                    how = "not";
                } else if (how == "smart") {
                    indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
                    if (indentation == Pass || indentation > 150) {
                        if (!aggressive) {
                            return
                        }
                        how = "prev";
                    }
                }
                if (how == "prev") {
                    if (n > doc.first) {
                        indentation = countColumn(getLine(doc, n - 1).text, null, tabSize);
                    } else {
                        indentation = 0;
                    }
                } else if (how == "add") {
                    indentation = curSpace + cm.options.indentUnit;
                } else if (how == "subtract") {
                    indentation = curSpace - cm.options.indentUnit;
                } else if (typeof how == "number") {
                    indentation = curSpace + how;
                }
                indentation = Math.max(0, indentation);

                var indentString = "", pos = 0;
                if (cm.options.indentWithTabs) {
                    for (var i = Math.floor(indentation / tabSize); i; --i) {
                        pos += tabSize;
                        indentString += "\t";
                    }
                }
                if (pos < indentation) {
                    indentString += spaceStr(indentation - pos);
                }

                if (indentString != curSpaceString) {
                    replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
                    line.stateAfter = null;
                    return true
                } else {
                    // Ensure that, if the cursor was in the whitespace at the start
                    // of the line, it is moved to the end of that space.
                    for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
                        var range = doc.sel.ranges[i$1];
                        if (range.head.line == n && range.head.ch < curSpaceString.length) {
                            var pos$1 = Pos(n, curSpaceString.length);
                            replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
                            break
                        }
                    }
                }
            }

            // This will be set to a {lineWise: bool, text: [string]} object, so
            // that, when pasting, we know what kind of selections the copied
            // text was made out of.
            var lastCopied = null;

            function setLastCopied(newLastCopied) {
                lastCopied = newLastCopied;
            }

            function applyTextInput(cm, inserted, deleted, sel, origin) {
                var doc = cm.doc;
                cm.display.shift = false;
                if (!sel) {
                    sel = doc.sel;
                }

                var paste = cm.state.pasteIncoming || origin == "paste";
                var textLines = splitLinesAuto(inserted), multiPaste = null;
                // When pasting N lines into N selections, insert one line per selection
                if (paste && sel.ranges.length > 1) {
                    if (lastCopied && lastCopied.text.join("\n") == inserted) {
                        if (sel.ranges.length % lastCopied.text.length == 0) {
                            multiPaste = [];
                            for (var i = 0; i < lastCopied.text.length; i++) {
                                multiPaste.push(doc.splitLines(lastCopied.text[i]));
                            }
                        }
                    } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
                        multiPaste = map(textLines, function (l) {
                            return [l];
                        });
                    }
                }

                var updateInput;
                // Normal behavior is to insert the new text into every selection
                for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
                    var range$$1 = sel.ranges[i$1];
                    var from = range$$1.from(), to = range$$1.to();
                    if (range$$1.empty()) {
                        if (deleted && deleted > 0) // Handle deletion
                        {
                            from = Pos(from.line, from.ch - deleted);
                        } else if (cm.state.overwrite && !paste) // Handle overwrite
                        {
                            to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length));
                        } else if (paste && lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted) {
                            from = to = Pos(from.line, 0);
                        }
                    }
                    updateInput = cm.curOp.updateInput;
                    var changeEvent = {
                        from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
                        origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")
                    };
                    makeChange(cm.doc, changeEvent);
                    signalLater(cm, "inputRead", cm, changeEvent);
                }
                if (inserted && !paste) {
                    triggerElectric(cm, inserted);
                }

                ensureCursorVisible(cm);
                cm.curOp.updateInput = updateInput;
                cm.curOp.typing = true;
                cm.state.pasteIncoming = cm.state.cutIncoming = false;
            }

            function handlePaste(e, cm) {
                var pasted = e.clipboardData && e.clipboardData.getData("Text");
                if (pasted) {
                    e.preventDefault();
                    if (!cm.isReadOnly() && !cm.options.disableInput) {
                        runInOp(cm, function () {
                            return applyTextInput(cm, pasted, 0, null, "paste");
                        });
                    }
                    return true
                }
            }

            function triggerElectric(cm, inserted) {
                // When an 'electric' character is inserted, immediately trigger a reindent
                if (!cm.options.electricChars || !cm.options.smartIndent) {
                    return
                }
                var sel = cm.doc.sel;

                for (var i = sel.ranges.length - 1; i >= 0; i--) {
                    var range$$1 = sel.ranges[i];
                    if (range$$1.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range$$1.head.line)) {
                        continue
                    }
                    var mode = cm.getModeAt(range$$1.head);
                    var indented = false;
                    if (mode.electricChars) {
                        for (var j = 0; j < mode.electricChars.length; j++) {
                            if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
                                indented = indentLine(cm, range$$1.head.line, "smart");
                                break
                            }
                        }
                    } else if (mode.electricInput) {
                        if (mode.electricInput.test(getLine(cm.doc, range$$1.head.line).text.slice(0, range$$1.head.ch))) {
                            indented = indentLine(cm, range$$1.head.line, "smart");
                        }
                    }
                    if (indented) {
                        signalLater(cm, "electricInput", cm, range$$1.head.line);
                    }
                }
            }

            function copyableRanges(cm) {
                var text = [], ranges = [];
                for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
                    var line = cm.doc.sel.ranges[i].head.line;
                    var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
                    ranges.push(lineRange);
                    text.push(cm.getRange(lineRange.anchor, lineRange.head));
                }
                return {text: text, ranges: ranges}
            }

            function disableBrowserMagic(field, spellcheck) {
                field.setAttribute("autocorrect", "off");
                field.setAttribute("autocapitalize", "off");
                field.setAttribute("spellcheck", !!spellcheck);
            }

            function hiddenTextarea() {
                var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none");
                var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
                // The textarea is kept positioned near the cursor to prevent the
                // fact that it'll be scrolled into view on input from scrolling
                // our fake cursor out of view. On webkit, when wrap=off, paste is
                // very slow. So make the area wide instead.
                if (webkit) {
                    te.style.width = "1000px";
                } else {
                    te.setAttribute("wrap", "off");
                }
                // If border: 0; -- iOS fails to open keyboard (issue #1287)
                if (ios) {
                    te.style.border = "1px solid black";
                }
                disableBrowserMagic(te);
                return div
            }

            // The publicly visible API. Note that methodOp(f) means
            // 'wrap f in an operation, performed on its `this` parameter'.

            // This is not the complete set of editor methods. Most of the
            // methods defined on the Doc type are also injected into
            // CodeMirror.prototype, for backwards compatibility and
            // convenience.

            function addEditorMethods(CodeMirror) {
                var optionHandlers = CodeMirror.optionHandlers;

                var helpers = CodeMirror.helpers = {};

                CodeMirror.prototype = {
                    constructor: CodeMirror,
                    focus: function () {
                        window.focus();
                        this.display.input.focus();
                    },

                    setOption: function (option, value) {
                        var options = this.options, old = options[option];
                        if (options[option] == value && option != "mode") {
                            return
                        }
                        options[option] = value;
                        if (optionHandlers.hasOwnProperty(option)) {
                            operation(this, optionHandlers[option])(this, value, old);
                        }
                        signal(this, "optionChange", this, option);
                    },

                    getOption: function (option) {
                        return this.options[option]
                    },
                    getDoc: function () {
                        return this.doc
                    },

                    addKeyMap: function (map$$1, bottom) {
                        this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map$$1));
                    },
                    removeKeyMap: function (map$$1) {
                        var maps = this.state.keyMaps;
                        for (var i = 0; i < maps.length; ++i) {
                            if (maps[i] == map$$1 || maps[i].name == map$$1) {
                                maps.splice(i, 1);
                                return true
                            }
                        }
                    },

                    addOverlay: methodOp(function (spec, options) {
                        var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
                        if (mode.startState) {
                            throw new Error("Overlays may not be stateful.")
                        }
                        insertSorted(this.state.overlays,
                            {
                                mode: mode, modeSpec: spec, opaque: options && options.opaque,
                                priority: (options && options.priority) || 0
                            },
                            function (overlay) {
                                return overlay.priority;
                            });
                        this.state.modeGen++;
                        regChange(this);
                    }),
                    removeOverlay: methodOp(function (spec) {
                        var this$1 = this;

                        var overlays = this.state.overlays;
                        for (var i = 0; i < overlays.length; ++i) {
                            var cur = overlays[i].modeSpec;
                            if (cur == spec || typeof spec == "string" && cur.name == spec) {
                                overlays.splice(i, 1);
                                this$1.state.modeGen++;
                                regChange(this$1);
                                return
                            }
                        }
                    }),

                    indentLine: methodOp(function (n, dir, aggressive) {
                        if (typeof dir != "string" && typeof dir != "number") {
                            if (dir == null) {
                                dir = this.options.smartIndent ? "smart" : "prev";
                            } else {
                                dir = dir ? "add" : "subtract";
                            }
                        }
                        if (isLine(this.doc, n)) {
                            indentLine(this, n, dir, aggressive);
                        }
                    }),
                    indentSelection: methodOp(function (how) {
                        var this$1 = this;

                        var ranges = this.doc.sel.ranges, end = -1;
                        for (var i = 0; i < ranges.length; i++) {
                            var range$$1 = ranges[i];
                            if (!range$$1.empty()) {
                                var from = range$$1.from(), to = range$$1.to();
                                var start = Math.max(end, from.line);
                                end = Math.min(this$1.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
                                for (var j = start; j < end; ++j) {
                                    indentLine(this$1, j, how);
                                }
                                var newRanges = this$1.doc.sel.ranges;
                                if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0) {
                                    replaceOneSelection(this$1.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll);
                                }
                            } else if (range$$1.head.line > end) {
                                indentLine(this$1, range$$1.head.line, how, true);
                                end = range$$1.head.line;
                                if (i == this$1.doc.sel.primIndex) {
                                    ensureCursorVisible(this$1);
                                }
                            }
                        }
                    }),

                    // Fetch the parser token for a given character. Useful for hacks
                    // that want to inspect the mode state (say, for completion).
                    getTokenAt: function (pos, precise) {
                        return takeToken(this, pos, precise)
                    },

                    getLineTokens: function (line, precise) {
                        return takeToken(this, Pos(line), precise, true)
                    },

                    getTokenTypeAt: function (pos) {
                        pos = clipPos(this.doc, pos);
                        var styles = getLineStyles(this, getLine(this.doc, pos.line));
                        var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
                        var type;
                        if (ch == 0) {
                            type = styles[2];
                        } else {
                            for (; ;) {
                                var mid = (before + after) >> 1;
                                if ((mid ? styles[mid * 2 - 1] : 0) >= ch) {
                                    after = mid;
                                } else if (styles[mid * 2 + 1] < ch) {
                                    before = mid + 1;
                                } else {
                                    type = styles[mid * 2 + 2];
                                    break
                                }
                            }
                        }
                        var cut = type ? type.indexOf("overlay ") : -1;
                        return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
                    },

                    getModeAt: function (pos) {
                        var mode = this.doc.mode;
                        if (!mode.innerMode) {
                            return mode
                        }
                        return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
                    },

                    getHelper: function (pos, type) {
                        return this.getHelpers(pos, type)[0]
                    },

                    getHelpers: function (pos, type) {
                        var this$1 = this;

                        var found = [];
                        if (!helpers.hasOwnProperty(type)) {
                            return found
                        }
                        var help = helpers[type], mode = this.getModeAt(pos);
                        if (typeof mode[type] == "string") {
                            if (help[mode[type]]) {
                                found.push(help[mode[type]]);
                            }
                        } else if (mode[type]) {
                            for (var i = 0; i < mode[type].length; i++) {
                                var val = help[mode[type][i]];
                                if (val) {
                                    found.push(val);
                                }
                            }
                        } else if (mode.helperType && help[mode.helperType]) {
                            found.push(help[mode.helperType]);
                        } else if (help[mode.name]) {
                            found.push(help[mode.name]);
                        }
                        for (var i$1 = 0; i$1 < help._global.length; i$1++) {
                            var cur = help._global[i$1];
                            if (cur.pred(mode, this$1) && indexOf(found, cur.val) == -1) {
                                found.push(cur.val);
                            }
                        }
                        return found
                    },

                    getStateAfter: function (line, precise) {
                        var doc = this.doc;
                        line = clipLine(doc, line == null ? doc.first + doc.size - 1 : line);
                        return getContextBefore(this, line + 1, precise).state
                    },

                    cursorCoords: function (start, mode) {
                        var pos, range$$1 = this.doc.sel.primary();
                        if (start == null) {
                            pos = range$$1.head;
                        } else if (typeof start == "object") {
                            pos = clipPos(this.doc, start);
                        } else {
                            pos = start ? range$$1.from() : range$$1.to();
                        }
                        return cursorCoords(this, pos, mode || "page")
                    },

                    charCoords: function (pos, mode) {
                        return charCoords(this, clipPos(this.doc, pos), mode || "page")
                    },

                    coordsChar: function (coords, mode) {
                        coords = fromCoordSystem(this, coords, mode || "page");
                        return coordsChar(this, coords.left, coords.top)
                    },

                    lineAtHeight: function (height, mode) {
                        height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
                        return lineAtHeight(this.doc, height + this.display.viewOffset)
                    },
                    heightAtLine: function (line, mode, includeWidgets) {
                        var end = false, lineObj;
                        if (typeof line == "number") {
                            var last = this.doc.first + this.doc.size - 1;
                            if (line < this.doc.first) {
                                line = this.doc.first;
                            } else if (line > last) {
                                line = last;
                                end = true;
                            }
                            lineObj = getLine(this.doc, line);
                        } else {
                            lineObj = line;
                        }
                        return intoCoordSystem(this, lineObj, {
                                top: 0,
                                left: 0
                            }, mode || "page", includeWidgets || end).top +
                            (end ? this.doc.height - heightAtLine(lineObj) : 0)
                    },

                    defaultTextHeight: function () {
                        return textHeight(this.display)
                    },
                    defaultCharWidth: function () {
                        return charWidth(this.display)
                    },

                    getViewport: function () {
                        return {from: this.display.viewFrom, to: this.display.viewTo}
                    },

                    addWidget: function (pos, node, scroll, vert, horiz) {
                        var display = this.display;
                        pos = cursorCoords(this, clipPos(this.doc, pos));
                        var top = pos.bottom, left = pos.left;
                        node.style.position = "absolute";
                        node.setAttribute("cm-ignore-events", "true");
                        this.display.input.setUneditable(node);
                        display.sizer.appendChild(node);
                        if (vert == "over") {
                            top = pos.top;
                        } else if (vert == "above" || vert == "near") {
                            var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
                                hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
                            // Default to positioning above (if specified and possible); otherwise default to positioning below
                            if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight) {
                                top = pos.top - node.offsetHeight;
                            } else if (pos.bottom + node.offsetHeight <= vspace) {
                                top = pos.bottom;
                            }
                            if (left + node.offsetWidth > hspace) {
                                left = hspace - node.offsetWidth;
                            }
                        }
                        node.style.top = top + "px";
                        node.style.left = node.style.right = "";
                        if (horiz == "right") {
                            left = display.sizer.clientWidth - node.offsetWidth;
                            node.style.right = "0px";
                        } else {
                            if (horiz == "left") {
                                left = 0;
                            } else if (horiz == "middle") {
                                left = (display.sizer.clientWidth - node.offsetWidth) / 2;
                            }
                            node.style.left = left + "px";
                        }
                        if (scroll) {
                            scrollIntoView(this, {
                                left: left,
                                top: top,
                                right: left + node.offsetWidth,
                                bottom: top + node.offsetHeight
                            });
                        }
                    },

                    triggerOnKeyDown: methodOp(onKeyDown),
                    triggerOnKeyPress: methodOp(onKeyPress),
                    triggerOnKeyUp: onKeyUp,
                    triggerOnMouseDown: methodOp(onMouseDown),

                    execCommand: function (cmd) {
                        if (commands.hasOwnProperty(cmd)) {
                            return commands[cmd].call(null, this)
                        }
                    },

                    triggerElectric: methodOp(function (text) {
                        triggerElectric(this, text);
                    }),

                    findPosH: function (from, amount, unit, visually) {
                        var this$1 = this;

                        var dir = 1;
                        if (amount < 0) {
                            dir = -1;
                            amount = -amount;
                        }
                        var cur = clipPos(this.doc, from);
                        for (var i = 0; i < amount; ++i) {
                            cur = findPosH(this$1.doc, cur, dir, unit, visually);
                            if (cur.hitSide) {
                                break
                            }
                        }
                        return cur
                    },

                    moveH: methodOp(function (dir, unit) {
                        var this$1 = this;

                        this.extendSelectionsBy(function (range$$1) {
                            if (this$1.display.shift || this$1.doc.extend || range$$1.empty()) {
                                return findPosH(this$1.doc, range$$1.head, dir, unit, this$1.options.rtlMoveVisually)
                            } else {
                                return dir < 0 ? range$$1.from() : range$$1.to()
                            }
                        }, sel_move);
                    }),

                    deleteH: methodOp(function (dir, unit) {
                        var sel = this.doc.sel, doc = this.doc;
                        if (sel.somethingSelected()) {
                            doc.replaceSelection("", null, "+delete");
                        } else {
                            deleteNearSelection(this, function (range$$1) {
                                var other = findPosH(doc, range$$1.head, dir, unit, false);
                                return dir < 0 ? {from: other, to: range$$1.head} : {from: range$$1.head, to: other}
                            });
                        }
                    }),

                    findPosV: function (from, amount, unit, goalColumn) {
                        var this$1 = this;

                        var dir = 1, x = goalColumn;
                        if (amount < 0) {
                            dir = -1;
                            amount = -amount;
                        }
                        var cur = clipPos(this.doc, from);
                        for (var i = 0; i < amount; ++i) {
                            var coords = cursorCoords(this$1, cur, "div");
                            if (x == null) {
                                x = coords.left;
                            } else {
                                coords.left = x;
                            }
                            cur = findPosV(this$1, coords, dir, unit);
                            if (cur.hitSide) {
                                break
                            }
                        }
                        return cur
                    },

                    moveV: methodOp(function (dir, unit) {
                        var this$1 = this;

                        var doc = this.doc, goals = [];
                        var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
                        doc.extendSelectionsBy(function (range$$1) {
                            if (collapse) {
                                return dir < 0 ? range$$1.from() : range$$1.to()
                            }
                            var headPos = cursorCoords(this$1, range$$1.head, "div");
                            if (range$$1.goalColumn != null) {
                                headPos.left = range$$1.goalColumn;
                            }
                            goals.push(headPos.left);
                            var pos = findPosV(this$1, headPos, dir, unit);
                            if (unit == "page" && range$$1 == doc.sel.primary()) {
                                addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top);
                            }
                            return pos
                        }, sel_move);
                        if (goals.length) {
                            for (var i = 0; i < doc.sel.ranges.length; i++) {
                                doc.sel.ranges[i].goalColumn = goals[i];
                            }
                        }
                    }),

                    // Find the word at the given position (as returned by coordsChar).
                    findWordAt: function (pos) {
                        var doc = this.doc, line = getLine(doc, pos.line).text;
                        var start = pos.ch, end = pos.ch;
                        if (line) {
                            var helper = this.getHelper(pos, "wordChars");
                            if ((pos.sticky == "before" || end == line.length) && start) {
                                --start;
                            } else {
                                ++end;
                            }
                            var startChar = line.charAt(start);
                            var check = isWordChar(startChar, helper)
                                ? function (ch) {
                                    return isWordChar(ch, helper);
                                }
                                : /\s/.test(startChar) ? function (ch) {
                                        return /\s/.test(ch);
                                    }
                                    : function (ch) {
                                        return (!/\s/.test(ch) && !isWordChar(ch));
                                    };
                            while (start > 0 && check(line.charAt(start - 1))) {
                                --start;
                            }
                            while (end < line.length && check(line.charAt(end))) {
                                ++end;
                            }
                        }
                        return new Range(Pos(pos.line, start), Pos(pos.line, end))
                    },

                    toggleOverwrite: function (value) {
                        if (value != null && value == this.state.overwrite) {
                            return
                        }
                        if (this.state.overwrite = !this.state.overwrite) {
                            addClass(this.display.cursorDiv, "CodeMirror-overwrite");
                        } else {
                            rmClass(this.display.cursorDiv, "CodeMirror-overwrite");
                        }

                        signal(this, "overwriteToggle", this, this.state.overwrite);
                    },
                    hasFocus: function () {
                        return this.display.input.getField() == activeElt()
                    },
                    isReadOnly: function () {
                        return !!(this.options.readOnly || this.doc.cantEdit)
                    },

                    scrollTo: methodOp(function (x, y) {
                        scrollToCoords(this, x, y);
                    }),
                    getScrollInfo: function () {
                        var scroller = this.display.scroller;
                        return {
                            left: scroller.scrollLeft, top: scroller.scrollTop,
                            height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
                            width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
                            clientHeight: displayHeight(this), clientWidth: displayWidth(this)
                        }
                    },

                    scrollIntoView: methodOp(function (range$$1, margin) {
                        if (range$$1 == null) {
                            range$$1 = {from: this.doc.sel.primary().head, to: null};
                            if (margin == null) {
                                margin = this.options.cursorScrollMargin;
                            }
                        } else if (typeof range$$1 == "number") {
                            range$$1 = {from: Pos(range$$1, 0), to: null};
                        } else if (range$$1.from == null) {
                            range$$1 = {from: range$$1, to: null};
                        }
                        if (!range$$1.to) {
                            range$$1.to = range$$1.from;
                        }
                        range$$1.margin = margin || 0;

                        if (range$$1.from.line != null) {
                            scrollToRange(this, range$$1);
                        } else {
                            scrollToCoordsRange(this, range$$1.from, range$$1.to, range$$1.margin);
                        }
                    }),

                    setSize: methodOp(function (width, height) {
                        var this$1 = this;

                        var interpret = function (val) {
                            return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;
                        };
                        if (width != null) {
                            this.display.wrapper.style.width = interpret(width);
                        }
                        if (height != null) {
                            this.display.wrapper.style.height = interpret(height);
                        }
                        if (this.options.lineWrapping) {
                            clearLineMeasurementCache(this);
                        }
                        var lineNo$$1 = this.display.viewFrom;
                        this.doc.iter(lineNo$$1, this.display.viewTo, function (line) {
                            if (line.widgets) {
                                for (var i = 0; i < line.widgets.length; i++) {
                                    if (line.widgets[i].noHScroll) {
                                        regLineChange(this$1, lineNo$$1, "widget");
                                        break
                                    }
                                }
                            }
                            ++lineNo$$1;
                        });
                        this.curOp.forceUpdate = true;
                        signal(this, "refresh", this);
                    }),

                    operation: function (f) {
                        return runInOp(this, f)
                    },
                    startOperation: function () {
                        return startOperation(this)
                    },
                    endOperation: function () {
                        return endOperation(this)
                    },

                    refresh: methodOp(function () {
                        var oldHeight = this.display.cachedTextHeight;
                        regChange(this);
                        this.curOp.forceUpdate = true;
                        clearCaches(this);
                        scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
                        updateGutterSpace(this);
                        if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5) {
                            estimateLineHeights(this);
                        }
                        signal(this, "refresh", this);
                    }),

                    swapDoc: methodOp(function (doc) {
                        var old = this.doc;
                        old.cm = null;
                        attachDoc(this, doc);
                        clearCaches(this);
                        this.display.input.reset();
                        scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
                        this.curOp.forceScroll = true;
                        signalLater(this, "swapDoc", this, old);
                        return old
                    }),

                    phrase: function (phraseText) {
                        var phrases = this.options.phrases;
                        return phrases && Object.prototype.hasOwnProperty.call(phrases, phraseText) ? phrases[phraseText] : phraseText
                    },

                    getInputField: function () {
                        return this.display.input.getField()
                    },
                    getWrapperElement: function () {
                        return this.display.wrapper
                    },
                    getScrollerElement: function () {
                        return this.display.scroller
                    },
                    getGutterElement: function () {
                        return this.display.gutters
                    }
                };
                eventMixin(CodeMirror);

                CodeMirror.registerHelper = function (type, name, value) {
                    if (!helpers.hasOwnProperty(type)) {
                        helpers[type] = CodeMirror[type] = {_global: []};
                    }
                    helpers[type][name] = value;
                };
                CodeMirror.registerGlobalHelper = function (type, name, predicate, value) {
                    CodeMirror.registerHelper(type, name, value);
                    helpers[type]._global.push({pred: predicate, val: value});
                };
            }

            // Used for horizontal relative motion. Dir is -1 or 1 (left or
            // right), unit can be "char", "column" (like char, but doesn't
            // cross line boundaries), "word" (across next word), or "group" (to
            // the start of next group of word or non-word-non-whitespace
            // chars). The visually param controls whether, in right-to-left
            // text, direction 1 means to move towards the next index in the
            // string, or towards the character to the right of the current
            // position. The resulting position will have a hitSide=true
            // property if it reached the end of the document.
            function findPosH(doc, pos, dir, unit, visually) {
                var oldPos = pos;
                var origDir = dir;
                var lineObj = getLine(doc, pos.line);

                function findNextLine() {
                    var l = pos.line + dir;
                    if (l < doc.first || l >= doc.first + doc.size) {
                        return false
                    }
                    pos = new Pos(l, pos.ch, pos.sticky);
                    return lineObj = getLine(doc, l)
                }

                function moveOnce(boundToLine) {
                    var next;
                    if (visually) {
                        next = moveVisually(doc.cm, lineObj, pos, dir);
                    } else {
                        next = moveLogically(lineObj, pos, dir);
                    }
                    if (next == null) {
                        if (!boundToLine && findNextLine()) {
                            pos = endOfLine(visually, doc.cm, lineObj, pos.line, dir);
                        } else {
                            return false
                        }
                    } else {
                        pos = next;
                    }
                    return true
                }

                if (unit == "char") {
                    moveOnce();
                } else if (unit == "column") {
                    moveOnce(true);
                } else if (unit == "word" || unit == "group") {
                    var sawType = null, group = unit == "group";
                    var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
                    for (var first = true; ; first = false) {
                        if (dir < 0 && !moveOnce(!first)) {
                            break
                        }
                        var cur = lineObj.text.charAt(pos.ch) || "\n";
                        var type = isWordChar(cur, helper) ? "w"
                            : group && cur == "\n" ? "n"
                                : !group || /\s/.test(cur) ? null
                                    : "p";
                        if (group && !first && !type) {
                            type = "s";
                        }
                        if (sawType && sawType != type) {
                            if (dir < 0) {
                                dir = 1;
                                moveOnce();
                                pos.sticky = "after";
                            }
                            break
                        }

                        if (type) {
                            sawType = type;
                        }
                        if (dir > 0 && !moveOnce(!first)) {
                            break
                        }
                    }
                }
                var result = skipAtomic(doc, pos, oldPos, origDir, true);
                if (equalCursorPos(oldPos, result)) {
                    result.hitSide = true;
                }
                return result
            }

            // For relative vertical movement. Dir may be -1 or 1. Unit can be
            // "page" or "line". The resulting position will have a hitSide=true
            // property if it reached the end of the document.
            function findPosV(cm, pos, dir, unit) {
                var doc = cm.doc, x = pos.left, y;
                if (unit == "page") {
                    var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
                    var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
                    y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;

                } else if (unit == "line") {
                    y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
                }
                var target;
                for (; ;) {
                    target = coordsChar(cm, x, y);
                    if (!target.outside) {
                        break
                    }
                    if (dir < 0 ? y <= 0 : y >= doc.height) {
                        target.hitSide = true;
                        break
                    }
                    y += dir * 5;
                }
                return target
            }

            // CONTENTEDITABLE INPUT STYLE

            var ContentEditableInput = function (cm) {
                this.cm = cm;
                this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
                this.polling = new Delayed();
                this.composing = null;
                this.gracePeriod = false;
                this.readDOMTimeout = null;
            };

            ContentEditableInput.prototype.init = function (display) {
                var this$1 = this;

                var input = this, cm = input.cm;
                var div = input.div = display.lineDiv;
                disableBrowserMagic(div, cm.options.spellcheck);

                on(div, "paste", function (e) {
                    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) {
                        return
                    }
                    // IE doesn't fire input events, so we schedule a read for the pasted content in this way
                    if (ie_version <= 11) {
                        setTimeout(operation(cm, function () {
                            return this$1.updateFromDOM();
                        }), 20);
                    }
                });

                on(div, "compositionstart", function (e) {
                    this$1.composing = {data: e.data, done: false};
                });
                on(div, "compositionupdate", function (e) {
                    if (!this$1.composing) {
                        this$1.composing = {data: e.data, done: false};
                    }
                });
                on(div, "compositionend", function (e) {
                    if (this$1.composing) {
                        if (e.data != this$1.composing.data) {
                            this$1.readFromDOMSoon();
                        }
                        this$1.composing.done = true;
                    }
                });

                on(div, "touchstart", function () {
                    return input.forceCompositionEnd();
                });

                on(div, "input", function () {
                    if (!this$1.composing) {
                        this$1.readFromDOMSoon();
                    }
                });

                function onCopyCut(e) {
                    if (signalDOMEvent(cm, e)) {
                        return
                    }
                    if (cm.somethingSelected()) {
                        setLastCopied({lineWise: false, text: cm.getSelections()});
                        if (e.type == "cut") {
                            cm.replaceSelection("", null, "cut");
                        }
                    } else if (!cm.options.lineWiseCopyCut) {
                        return
                    } else {
                        var ranges = copyableRanges(cm);
                        setLastCopied({lineWise: true, text: ranges.text});
                        if (e.type == "cut") {
                            cm.operation(function () {
                                cm.setSelections(ranges.ranges, 0, sel_dontScroll);
                                cm.replaceSelection("", null, "cut");
                            });
                        }
                    }
                    if (e.clipboardData) {
                        e.clipboardData.clearData();
                        var content = lastCopied.text.join("\n");
                        // iOS exposes the clipboard API, but seems to discard content inserted into it
                        e.clipboardData.setData("Text", content);
                        if (e.clipboardData.getData("Text") == content) {
                            e.preventDefault();
                            return
                        }
                    }
                    // Old-fashioned briefly-focus-a-textarea hack
                    var kludge = hiddenTextarea(), te = kludge.firstChild;
                    cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
                    te.value = lastCopied.text.join("\n");
                    var hadFocus = document.activeElement;
                    selectInput(te);
                    setTimeout(function () {
                        cm.display.lineSpace.removeChild(kludge);
                        hadFocus.focus();
                        if (hadFocus == div) {
                            input.showPrimarySelection();
                        }
                    }, 50);
                }

                on(div, "copy", onCopyCut);
                on(div, "cut", onCopyCut);
            };

            ContentEditableInput.prototype.prepareSelection = function () {
                var result = prepareSelection(this.cm, false);
                result.focus = this.cm.state.focused;
                return result
            };

            ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
                if (!info || !this.cm.display.view.length) {
                    return
                }
                if (info.focus || takeFocus) {
                    this.showPrimarySelection();
                }
                this.showMultipleSelections(info);
            };

            ContentEditableInput.prototype.getSelection = function () {
                return this.cm.display.wrapper.ownerDocument.getSelection()
            };

            ContentEditableInput.prototype.showPrimarySelection = function () {
                var sel = this.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();
                var from = prim.from(), to = prim.to();

                if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
                    sel.removeAllRanges();
                    return
                }

                var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
                var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
                if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
                    cmp(minPos(curAnchor, curFocus), from) == 0 &&
                    cmp(maxPos(curAnchor, curFocus), to) == 0) {
                    return
                }

                var view = cm.display.view;
                var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
                    {node: view[0].measure.map[2], offset: 0};
                var end = to.line < cm.display.viewTo && posToDOM(cm, to);
                if (!end) {
                    var measure = view[view.length - 1].measure;
                    var map$$1 = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
                    end = {
                        node: map$$1[map$$1.length - 1],
                        offset: map$$1[map$$1.length - 2] - map$$1[map$$1.length - 3]
                    };
                }

                if (!start || !end) {
                    sel.removeAllRanges();
                    return
                }

                var old = sel.rangeCount && sel.getRangeAt(0), rng;
                try {
                    rng = range(start.node, start.offset, end.offset, end.node);
                } catch (e) {
                } // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
                if (rng) {
                    if (!gecko && cm.state.focused) {
                        sel.collapse(start.node, start.offset);
                        if (!rng.collapsed) {
                            sel.removeAllRanges();
                            sel.addRange(rng);
                        }
                    } else {
                        sel.removeAllRanges();
                        sel.addRange(rng);
                    }
                    if (old && sel.anchorNode == null) {
                        sel.addRange(old);
                    } else if (gecko) {
                        this.startGracePeriod();
                    }
                }
                this.rememberSelection();
            };

            ContentEditableInput.prototype.startGracePeriod = function () {
                var this$1 = this;

                clearTimeout(this.gracePeriod);
                this.gracePeriod = setTimeout(function () {
                    this$1.gracePeriod = false;
                    if (this$1.selectionChanged()) {
                        this$1.cm.operation(function () {
                            return this$1.cm.curOp.selectionChanged = true;
                        });
                    }
                }, 20);
            };

            ContentEditableInput.prototype.showMultipleSelections = function (info) {
                removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
                removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
            };

            ContentEditableInput.prototype.rememberSelection = function () {
                var sel = this.getSelection();
                this.lastAnchorNode = sel.anchorNode;
                this.lastAnchorOffset = sel.anchorOffset;
                this.lastFocusNode = sel.focusNode;
                this.lastFocusOffset = sel.focusOffset;
            };

            ContentEditableInput.prototype.selectionInEditor = function () {
                var sel = this.getSelection();
                if (!sel.rangeCount) {
                    return false
                }
                var node = sel.getRangeAt(0).commonAncestorContainer;
                return contains(this.div, node)
            };

            ContentEditableInput.prototype.focus = function () {
                if (this.cm.options.readOnly != "nocursor") {
                    if (!this.selectionInEditor()) {
                        this.showSelection(this.prepareSelection(), true);
                    }
                    this.div.focus();
                }
            };
            ContentEditableInput.prototype.blur = function () {
                this.div.blur();
            };
            ContentEditableInput.prototype.getField = function () {
                return this.div
            };

            ContentEditableInput.prototype.supportsTouch = function () {
                return true
            };

            ContentEditableInput.prototype.receivedFocus = function () {
                var input = this;
                if (this.selectionInEditor()) {
                    this.pollSelection();
                } else {
                    runInOp(this.cm, function () {
                        return input.cm.curOp.selectionChanged = true;
                    });
                }

                function poll() {
                    if (input.cm.state.focused) {
                        input.pollSelection();
                        input.polling.set(input.cm.options.pollInterval, poll);
                    }
                }

                this.polling.set(this.cm.options.pollInterval, poll);
            };

            ContentEditableInput.prototype.selectionChanged = function () {
                var sel = this.getSelection();
                return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
                    sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
            };

            ContentEditableInput.prototype.pollSelection = function () {
                if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) {
                    return
                }
                var sel = this.getSelection(), cm = this.cm;
                // On Android Chrome (version 56, at least), backspacing into an
                // uneditable block element will put the cursor in that element,
                // and then, because it's not editable, hide the virtual keyboard.
                // Because Android doesn't allow us to actually detect backspace
                // presses in a sane way, this code checks for when that happens
                // and simulates a backspace press in this case.
                if (android && chrome && this.cm.options.gutters.length && isInGutter(sel.anchorNode)) {
                    this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs});
                    this.blur();
                    this.focus();
                    return
                }
                if (this.composing) {
                    return
                }
                this.rememberSelection();
                var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
                var head = domToPos(cm, sel.focusNode, sel.focusOffset);
                if (anchor && head) {
                    runInOp(cm, function () {
                        setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
                        if (anchor.bad || head.bad) {
                            cm.curOp.selectionChanged = true;
                        }
                    });
                }
            };

            ContentEditableInput.prototype.pollContent = function () {
                if (this.readDOMTimeout != null) {
                    clearTimeout(this.readDOMTimeout);
                    this.readDOMTimeout = null;
                }

                var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
                var from = sel.from(), to = sel.to();
                if (from.ch == 0 && from.line > cm.firstLine()) {
                    from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length);
                }
                if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine()) {
                    to = Pos(to.line + 1, 0);
                }
                if (from.line < display.viewFrom || to.line > display.viewTo - 1) {
                    return false
                }

                var fromIndex, fromLine, fromNode;
                if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
                    fromLine = lineNo(display.view[0].line);
                    fromNode = display.view[0].node;
                } else {
                    fromLine = lineNo(display.view[fromIndex].line);
                    fromNode = display.view[fromIndex - 1].node.nextSibling;
                }
                var toIndex = findViewIndex(cm, to.line);
                var toLine, toNode;
                if (toIndex == display.view.length - 1) {
                    toLine = display.viewTo - 1;
                    toNode = display.lineDiv.lastChild;
                } else {
                    toLine = lineNo(display.view[toIndex + 1].line) - 1;
                    toNode = display.view[toIndex + 1].node.previousSibling;
                }

                if (!fromNode) {
                    return false
                }
                var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
                var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
                while (newText.length > 1 && oldText.length > 1) {
                    if (lst(newText) == lst(oldText)) {
                        newText.pop();
                        oldText.pop();
                        toLine--;
                    } else if (newText[0] == oldText[0]) {
                        newText.shift();
                        oldText.shift();
                        fromLine++;
                    } else {
                        break
                    }
                }

                var cutFront = 0, cutEnd = 0;
                var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
                while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront)) {
                    ++cutFront;
                }
                var newBot = lst(newText), oldBot = lst(oldText);
                var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
                    oldBot.length - (oldText.length == 1 ? cutFront : 0));
                while (cutEnd < maxCutEnd &&
                newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
                    ++cutEnd;
                }
                // Try to move start of change to start of selection if ambiguous
                if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
                    while (cutFront && cutFront > from.ch &&
                    newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
                        cutFront--;
                        cutEnd++;
                    }
                }

                newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
                newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");

                var chFrom = Pos(fromLine, cutFront);
                var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
                if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
                    replaceRange(cm.doc, newText, chFrom, chTo, "+input");
                    return true
                }
            };

            ContentEditableInput.prototype.ensurePolled = function () {
                this.forceCompositionEnd();
            };
            ContentEditableInput.prototype.reset = function () {
                this.forceCompositionEnd();
            };
            ContentEditableInput.prototype.forceCompositionEnd = function () {
                if (!this.composing) {
                    return
                }
                clearTimeout(this.readDOMTimeout);
                this.composing = null;
                this.updateFromDOM();
                this.div.blur();
                this.div.focus();
            };
            ContentEditableInput.prototype.readFromDOMSoon = function () {
                var this$1 = this;

                if (this.readDOMTimeout != null) {
                    return
                }
                this.readDOMTimeout = setTimeout(function () {
                    this$1.readDOMTimeout = null;
                    if (this$1.composing) {
                        if (this$1.composing.done) {
                            this$1.composing = null;
                        } else {
                            return
                        }
                    }
                    this$1.updateFromDOM();
                }, 80);
            };

            ContentEditableInput.prototype.updateFromDOM = function () {
                var this$1 = this;

                if (this.cm.isReadOnly() || !this.pollContent()) {
                    runInOp(this.cm, function () {
                        return regChange(this$1.cm);
                    });
                }
            };

            ContentEditableInput.prototype.setUneditable = function (node) {
                node.contentEditable = "false";
            };

            ContentEditableInput.prototype.onKeyPress = function (e) {
                if (e.charCode == 0 || this.composing) {
                    return
                }
                e.preventDefault();
                if (!this.cm.isReadOnly()) {
                    operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0);
                }
            };

            ContentEditableInput.prototype.readOnlyChanged = function (val) {
                this.div.contentEditable = String(val != "nocursor");
            };

            ContentEditableInput.prototype.onContextMenu = function () {
            };
            ContentEditableInput.prototype.resetPosition = function () {
            };

            ContentEditableInput.prototype.needsContentAttribute = true;

            function posToDOM(cm, pos) {
                var view = findViewForLine(cm, pos.line);
                if (!view || view.hidden) {
                    return null
                }
                var line = getLine(cm.doc, pos.line);
                var info = mapFromLineView(view, line, pos.line);

                var order = getOrder(line, cm.doc.direction), side = "left";
                if (order) {
                    var partPos = getBidiPartAt(order, pos.ch);
                    side = partPos % 2 ? "right" : "left";
                }
                var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
                result.offset = result.collapse == "right" ? result.end : result.start;
                return result
            }

            function isInGutter(node) {
                for (var scan = node; scan; scan = scan.parentNode) {
                    if (/CodeMirror-gutter-wrapper/.test(scan.className)) {
                        return true
                    }
                }
                return false
            }

            function badPos(pos, bad) {
                if (bad) {
                    pos.bad = true;
                }
                return pos
            }

            function domTextBetween(cm, from, to, fromLine, toLine) {
                var text = "", closing = false, lineSep = cm.doc.lineSeparator(), extraLinebreak = false;

                function recognizeMarker(id) {
                    return function (marker) {
                        return marker.id == id;
                    }
                }

                function close() {
                    if (closing) {
                        text += lineSep;
                        if (extraLinebreak) {
                            text += lineSep;
                        }
                        closing = extraLinebreak = false;
                    }
                }

                function addText(str) {
                    if (str) {
                        close();
                        text += str;
                    }
                }

                function walk(node) {
                    if (node.nodeType == 1) {
                        var cmText = node.getAttribute("cm-text");
                        if (cmText) {
                            addText(cmText);
                            return
                        }
                        var markerID = node.getAttribute("cm-marker"), range$$1;
                        if (markerID) {
                            var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
                            if (found.length && (range$$1 = found[0].find(0))) {
                                addText(getBetween(cm.doc, range$$1.from, range$$1.to).join(lineSep));
                            }
                            return
                        }
                        if (node.getAttribute("contenteditable") == "false") {
                            return
                        }
                        var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);
                        if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) {
                            return
                        }

                        if (isBlock) {
                            close();
                        }
                        for (var i = 0; i < node.childNodes.length; i++) {
                            walk(node.childNodes[i]);
                        }

                        if (/^(pre|p)$/i.test(node.nodeName)) {
                            extraLinebreak = true;
                        }
                        if (isBlock) {
                            closing = true;
                        }
                    } else if (node.nodeType == 3) {
                        addText(node.nodeValue.replace(/\u200b/g, "").replace(/\u00a0/g, " "));
                    }
                }

                for (; ;) {
                    walk(from);
                    if (from == to) {
                        break
                    }
                    from = from.nextSibling;
                    extraLinebreak = false;
                }
                return text
            }

            function domToPos(cm, node, offset) {
                var lineNode;
                if (node == cm.display.lineDiv) {
                    lineNode = cm.display.lineDiv.childNodes[offset];
                    if (!lineNode) {
                        return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true)
                    }
                    node = null;
                    offset = 0;
                } else {
                    for (lineNode = node; ; lineNode = lineNode.parentNode) {
                        if (!lineNode || lineNode == cm.display.lineDiv) {
                            return null
                        }
                        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) {
                            break
                        }
                    }
                }
                for (var i = 0; i < cm.display.view.length; i++) {
                    var lineView = cm.display.view[i];
                    if (lineView.node == lineNode) {
                        return locateNodeInLineView(lineView, node, offset)
                    }
                }
            }

            function locateNodeInLineView(lineView, node, offset) {
                var wrapper = lineView.text.firstChild, bad = false;
                if (!node || !contains(wrapper, node)) {
                    return badPos(Pos(lineNo(lineView.line), 0), true)
                }
                if (node == wrapper) {
                    bad = true;
                    node = wrapper.childNodes[offset];
                    offset = 0;
                    if (!node) {
                        var line = lineView.rest ? lst(lineView.rest) : lineView.line;
                        return badPos(Pos(lineNo(line), line.text.length), bad)
                    }
                }

                var textNode = node.nodeType == 3 ? node : null, topNode = node;
                if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
                    textNode = node.firstChild;
                    if (offset) {
                        offset = textNode.nodeValue.length;
                    }
                }
                while (topNode.parentNode != wrapper) {
                    topNode = topNode.parentNode;
                }
                var measure = lineView.measure, maps = measure.maps;

                function find(textNode, topNode, offset) {
                    for (var i = -1; i < (maps ? maps.length : 0); i++) {
                        var map$$1 = i < 0 ? measure.map : maps[i];
                        for (var j = 0; j < map$$1.length; j += 3) {
                            var curNode = map$$1[j + 2];
                            if (curNode == textNode || curNode == topNode) {
                                var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
                                var ch = map$$1[j] + offset;
                                if (offset < 0 || curNode != textNode) {
                                    ch = map$$1[j + (offset ? 1 : 0)];
                                }
                                return Pos(line, ch)
                            }
                        }
                    }
                }

                var found = find(textNode, topNode, offset);
                if (found) {
                    return badPos(found, bad)
                }

                // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
                for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
                    found = find(after, after.firstChild, 0);
                    if (found) {
                        return badPos(Pos(found.line, found.ch - dist), bad)
                    } else {
                        dist += after.textContent.length;
                    }
                }
                for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
                    found = find(before, before.firstChild, -1);
                    if (found) {
                        return badPos(Pos(found.line, found.ch + dist$1), bad)
                    } else {
                        dist$1 += before.textContent.length;
                    }
                }
            }

            // TEXTAREA INPUT STYLE

            var TextareaInput = function (cm) {
                this.cm = cm;
                // See input.poll and input.reset
                this.prevInput = "";

                // Flag that indicates whether we expect input to appear real soon
                // now (after some event like 'keypress' or 'input') and are
                // polling intensively.
                this.pollingFast = false;
                // Self-resetting timeout for the poller
                this.polling = new Delayed();
                // Used to work around IE issue with selection being forgotten when focus moves away from textarea
                this.hasSelection = false;
                this.composing = null;
            };

            TextareaInput.prototype.init = function (display) {
                var this$1 = this;

                var input = this, cm = this.cm;
                this.createField(display);
                var te = this.textarea;

                display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);

                // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
                if (ios) {
                    te.style.width = "0px";
                }

                on(te, "input", function () {
                    if (ie && ie_version >= 9 && this$1.hasSelection) {
                        this$1.hasSelection = null;
                    }
                    input.poll();
                });

                on(te, "paste", function (e) {
                    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) {
                        return
                    }

                    cm.state.pasteIncoming = true;
                    input.fastPoll();
                });

                function prepareCopyCut(e) {
                    if (signalDOMEvent(cm, e)) {
                        return
                    }
                    if (cm.somethingSelected()) {
                        setLastCopied({lineWise: false, text: cm.getSelections()});
                    } else if (!cm.options.lineWiseCopyCut) {
                        return
                    } else {
                        var ranges = copyableRanges(cm);
                        setLastCopied({lineWise: true, text: ranges.text});
                        if (e.type == "cut") {
                            cm.setSelections(ranges.ranges, null, sel_dontScroll);
                        } else {
                            input.prevInput = "";
                            te.value = ranges.text.join("\n");
                            selectInput(te);
                        }
                    }
                    if (e.type == "cut") {
                        cm.state.cutIncoming = true;
                    }
                }

                on(te, "cut", prepareCopyCut);
                on(te, "copy", prepareCopyCut);

                on(display.scroller, "paste", function (e) {
                    if (eventInWidget(display, e) || signalDOMEvent(cm, e)) {
                        return
                    }
                    cm.state.pasteIncoming = true;
                    input.focus();
                });

                // Prevent normal selection in the editor (we handle our own)
                on(display.lineSpace, "selectstart", function (e) {
                    if (!eventInWidget(display, e)) {
                        e_preventDefault(e);
                    }
                });

                on(te, "compositionstart", function () {
                    var start = cm.getCursor("from");
                    if (input.composing) {
                        input.composing.range.clear();
                    }
                    input.composing = {
                        start: start,
                        range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
                    };
                });
                on(te, "compositionend", function () {
                    if (input.composing) {
                        input.poll();
                        input.composing.range.clear();
                        input.composing = null;
                    }
                });
            };

            TextareaInput.prototype.createField = function (_display) {
                // Wraps and hides input textarea
                this.wrapper = hiddenTextarea();
                // The semihidden textarea that is focused when the editor is
                // focused, and receives input.
                this.textarea = this.wrapper.firstChild;
            };

            TextareaInput.prototype.prepareSelection = function () {
                // Redraw the selection and/or cursor
                var cm = this.cm, display = cm.display, doc = cm.doc;
                var result = prepareSelection(cm);

                // Move the hidden textarea near the cursor to prevent scrolling artifacts
                if (cm.options.moveInputWithCursor) {
                    var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
                    var wrapOff = display.wrapper.getBoundingClientRect(),
                        lineOff = display.lineDiv.getBoundingClientRect();
                    result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
                        headPos.top + lineOff.top - wrapOff.top));
                    result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
                        headPos.left + lineOff.left - wrapOff.left));
                }

                return result
            };

            TextareaInput.prototype.showSelection = function (drawn) {
                var cm = this.cm, display = cm.display;
                removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
                removeChildrenAndAdd(display.selectionDiv, drawn.selection);
                if (drawn.teTop != null) {
                    this.wrapper.style.top = drawn.teTop + "px";
                    this.wrapper.style.left = drawn.teLeft + "px";
                }
            };

            // Reset the input to correspond to the selection (or to be empty,
            // when not typing and nothing is selected)
            TextareaInput.prototype.reset = function (typing) {
                if (this.contextMenuPending || this.composing) {
                    return
                }
                var cm = this.cm;
                if (cm.somethingSelected()) {
                    this.prevInput = "";
                    var content = cm.getSelection();
                    this.textarea.value = content;
                    if (cm.state.focused) {
                        selectInput(this.textarea);
                    }
                    if (ie && ie_version >= 9) {
                        this.hasSelection = content;
                    }
                } else if (!typing) {
                    this.prevInput = this.textarea.value = "";
                    if (ie && ie_version >= 9) {
                        this.hasSelection = null;
                    }
                }
            };

            TextareaInput.prototype.getField = function () {
                return this.textarea
            };

            TextareaInput.prototype.supportsTouch = function () {
                return false
            };

            TextareaInput.prototype.focus = function () {
                if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
                    try {
                        this.textarea.focus();
                    } catch (e) {
                    } // IE8 will throw if the textarea is display: none or not in DOM
                }
            };

            TextareaInput.prototype.blur = function () {
                this.textarea.blur();
            };

            TextareaInput.prototype.resetPosition = function () {
                this.wrapper.style.top = this.wrapper.style.left = 0;
            };

            TextareaInput.prototype.receivedFocus = function () {
                this.slowPoll();
            };

            // Poll for input changes, using the normal rate of polling. This
            // runs as long as the editor is focused.
            TextareaInput.prototype.slowPoll = function () {
                var this$1 = this;

                if (this.pollingFast) {
                    return
                }
                this.polling.set(this.cm.options.pollInterval, function () {
                    this$1.poll();
                    if (this$1.cm.state.focused) {
                        this$1.slowPoll();
                    }
                });
            };

            // When an event has just come in that is likely to add or change
            // something in the input textarea, we poll faster, to ensure that
            // the change appears on the screen quickly.
            TextareaInput.prototype.fastPoll = function () {
                var missed = false, input = this;
                input.pollingFast = true;

                function p() {
                    var changed = input.poll();
                    if (!changed && !missed) {
                        missed = true;
                        input.polling.set(60, p);
                    } else {
                        input.pollingFast = false;
                        input.slowPoll();
                    }
                }

                input.polling.set(20, p);
            };

            // Read input from the textarea, and update the document to match.
            // When something is selected, it is present in the textarea, and
            // selected (unless it is huge, in which case a placeholder is
            // used). When nothing is selected, the cursor sits after previously
            // seen text (can be empty), which is stored in prevInput (we must
            // not reset the textarea when typing, because that breaks IME).
            TextareaInput.prototype.poll = function () {
                var this$1 = this;

                var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
                // Since this is called a *lot*, try to bail out as cheaply as
                // possible when it is clear that nothing happened. hasSelection
                // will be the case when there is a lot of text in the textarea,
                // in which case reading its value would be expensive.
                if (this.contextMenuPending || !cm.state.focused ||
                    (hasSelection(input) && !prevInput && !this.composing) ||
                    cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq) {
                    return false
                }

                var text = input.value;
                // If nothing changed, bail.
                if (text == prevInput && !cm.somethingSelected()) {
                    return false
                }
                // Work around nonsensical selection resetting in IE9/10, and
                // inexplicable appearance of private area unicode characters on
                // some key combos in Mac (#2689).
                if (ie && ie_version >= 9 && this.hasSelection === text ||
                    mac && /[\uf700-\uf7ff]/.test(text)) {
                    cm.display.input.reset();
                    return false
                }

                if (cm.doc.sel == cm.display.selForContextMenu) {
                    var first = text.charCodeAt(0);
                    if (first == 0x200b && !prevInput) {
                        prevInput = "\u200b";
                    }
                    if (first == 0x21da) {
                        this.reset();
                        return this.cm.execCommand("undo")
                    }
                }
                // Find the part of the input that is actually new
                var same = 0, l = Math.min(prevInput.length, text.length);
                while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) {
                    ++same;
                }

                runInOp(cm, function () {
                    applyTextInput(cm, text.slice(same), prevInput.length - same,
                        null, this$1.composing ? "*compose" : null);

                    // Don't leave long text in the textarea, since it makes further polling slow
                    if (text.length > 1000 || text.indexOf("\n") > -1) {
                        input.value = this$1.prevInput = "";
                    } else {
                        this$1.prevInput = text;
                    }

                    if (this$1.composing) {
                        this$1.composing.range.clear();
                        this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
                            {className: "CodeMirror-composing"});
                    }
                });
                return true
            };

            TextareaInput.prototype.ensurePolled = function () {
                if (this.pollingFast && this.poll()) {
                    this.pollingFast = false;
                }
            };

            TextareaInput.prototype.onKeyPress = function () {
                if (ie && ie_version >= 9) {
                    this.hasSelection = null;
                }
                this.fastPoll();
            };

            TextareaInput.prototype.onContextMenu = function (e) {
                var input = this, cm = input.cm, display = cm.display, te = input.textarea;
                var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
                if (!pos || presto) {
                    return
                } // Opera is difficult.

                // Reset the current text selection only if the click is done outside of the selection
                // and 'resetSelectionOnContextMenu' option is true.
                var reset = cm.options.resetSelectionOnContextMenu;
                if (reset && cm.doc.sel.contains(pos) == -1) {
                    operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll);
                }

                var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
                input.wrapper.style.cssText = "position: absolute";
                var wrapperBox = input.wrapper.getBoundingClientRect();
                te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
                var oldScrollY;
                if (webkit) {
                    oldScrollY = window.scrollY;
                } // Work around Chrome issue (#2712)
                display.input.focus();
                if (webkit) {
                    window.scrollTo(null, oldScrollY);
                }
                display.input.reset();
                // Adds "Select all" to context menu in FF
                if (!cm.somethingSelected()) {
                    te.value = input.prevInput = " ";
                }
                input.contextMenuPending = true;
                display.selForContextMenu = cm.doc.sel;
                clearTimeout(display.detectingSelectAll);

                // Select-all will be greyed out if there's nothing to select, so
                // this adds a zero-width space so that we can later check whether
                // it got selected.
                function prepareSelectAllHack() {
                    if (te.selectionStart != null) {
                        var selected = cm.somethingSelected();
                        var extval = "\u200b" + (selected ? te.value : "");
                        te.value = "\u21da"; // Used to catch context-menu undo
                        te.value = extval;
                        input.prevInput = selected ? "" : "\u200b";
                        te.selectionStart = 1;
                        te.selectionEnd = extval.length;
                        // Re-set this, in case some other handler touched the
                        // selection in the meantime.
                        display.selForContextMenu = cm.doc.sel;
                    }
                }

                function rehide() {
                    input.contextMenuPending = false;
                    input.wrapper.style.cssText = oldWrapperCSS;
                    te.style.cssText = oldCSS;
                    if (ie && ie_version < 9) {
                        display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos);
                    }

                    // Try to detect the user choosing select-all
                    if (te.selectionStart != null) {
                        if (!ie || (ie && ie_version < 9)) {
                            prepareSelectAllHack();
                        }
                        var i = 0, poll = function () {
                            if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
                                te.selectionEnd > 0 && input.prevInput == "\u200b") {
                                operation(cm, selectAll)(cm);
                            } else if (i++ < 10) {
                                display.detectingSelectAll = setTimeout(poll, 500);
                            } else {
                                display.selForContextMenu = null;
                                display.input.reset();
                            }
                        };
                        display.detectingSelectAll = setTimeout(poll, 200);
                    }
                }

                if (ie && ie_version >= 9) {
                    prepareSelectAllHack();
                }
                if (captureRightClick) {
                    e_stop(e);
                    var mouseup = function () {
                        off(window, "mouseup", mouseup);
                        setTimeout(rehide, 20);
                    };
                    on(window, "mouseup", mouseup);
                } else {
                    setTimeout(rehide, 50);
                }
            };

            TextareaInput.prototype.readOnlyChanged = function (val) {
                if (!val) {
                    this.reset();
                }
                this.textarea.disabled = val == "nocursor";
            };

            TextareaInput.prototype.setUneditable = function () {
            };

            TextareaInput.prototype.needsContentAttribute = false;

            function fromTextArea(textarea, options) {
                options = options ? copyObj(options) : {};
                options.value = textarea.value;
                if (!options.tabindex && textarea.tabIndex) {
                    options.tabindex = textarea.tabIndex;
                }
                if (!options.placeholder && textarea.placeholder) {
                    options.placeholder = textarea.placeholder;
                }
                // Set autofocus to true if this textarea is focused, or if it has
                // autofocus and no other element is focused.
                if (options.autofocus == null) {
                    var hasFocus = activeElt();
                    options.autofocus = hasFocus == textarea ||
                        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
                }

                function save() {
                    textarea.value = cm.getValue();
                }

                var realSubmit;
                if (textarea.form) {
                    on(textarea.form, "submit", save);
                    // Deplorable hack to make the submit method do the right thing.
                    if (!options.leaveSubmitMethodAlone) {
                        var form = textarea.form;
                        realSubmit = form.submit;
                        try {
                            var wrappedSubmit = form.submit = function () {
                                save();
                                form.submit = realSubmit;
                                form.submit();
                                form.submit = wrappedSubmit;
                            };
                        } catch (e) {
                        }
                    }
                }

                options.finishInit = function (cm) {
                    cm.save = save;
                    cm.getTextArea = function () {
                        return textarea;
                    };
                    cm.toTextArea = function () {
                        cm.toTextArea = isNaN; // Prevent this from being ran twice
                        save();
                        textarea.parentNode.removeChild(cm.getWrapperElement());
                        textarea.style.display = "";
                        if (textarea.form) {
                            off(textarea.form, "submit", save);
                            if (typeof textarea.form.submit == "function") {
                                textarea.form.submit = realSubmit;
                            }
                        }
                    };
                };

                textarea.style.display = "none";
                var cm = CodeMirror(function (node) {
                        return textarea.parentNode.insertBefore(node, textarea.nextSibling);
                    },
                    options);
                return cm
            }

            function addLegacyProps(CodeMirror) {
                CodeMirror.off = off;
                CodeMirror.on = on;
                CodeMirror.wheelEventPixels = wheelEventPixels;
                CodeMirror.Doc = Doc;
                CodeMirror.splitLines = splitLinesAuto;
                CodeMirror.countColumn = countColumn;
                CodeMirror.findColumn = findColumn;
                CodeMirror.isWordChar = isWordCharBasic;
                CodeMirror.Pass = Pass;
                CodeMirror.signal = signal;
                CodeMirror.Line = Line;
                CodeMirror.changeEnd = changeEnd;
                CodeMirror.scrollbarModel = scrollbarModel;
                CodeMirror.Pos = Pos;
                CodeMirror.cmpPos = cmp;
                CodeMirror.modes = modes;
                CodeMirror.mimeModes = mimeModes;
                CodeMirror.resolveMode = resolveMode;
                CodeMirror.getMode = getMode;
                CodeMirror.modeExtensions = modeExtensions;
                CodeMirror.extendMode = extendMode;
                CodeMirror.copyState = copyState;
                CodeMirror.startState = startState;
                CodeMirror.innerMode = innerMode;
                CodeMirror.commands = commands;
                CodeMirror.keyMap = keyMap;
                CodeMirror.keyName = keyName;
                CodeMirror.isModifierKey = isModifierKey;
                CodeMirror.lookupKey = lookupKey;
                CodeMirror.normalizeKeyMap = normalizeKeyMap;
                CodeMirror.StringStream = StringStream;
                CodeMirror.SharedTextMarker = SharedTextMarker;
                CodeMirror.TextMarker = TextMarker;
                CodeMirror.LineWidget = LineWidget;
                CodeMirror.e_preventDefault = e_preventDefault;
                CodeMirror.e_stopPropagation = e_stopPropagation;
                CodeMirror.e_stop = e_stop;
                CodeMirror.addClass = addClass;
                CodeMirror.contains = contains;
                CodeMirror.rmClass = rmClass;
                CodeMirror.keyNames = keyNames;
            }

            // EDITOR CONSTRUCTOR

            defineOptions(CodeMirror);

            addEditorMethods(CodeMirror);

            // Set up methods on CodeMirror's prototype to redirect to the editor's document.
            var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
            for (var prop in Doc.prototype) {
                if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0) {
                    CodeMirror.prototype[prop] = (function (method) {
                        return function () {
                            return method.apply(this.doc, arguments)
                        }
                    })(Doc.prototype[prop]);
                }
            }

            eventMixin(Doc);
            CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};

            // Extra arguments are stored as the mode's dependencies, which is
            // used by (legacy) mechanisms like loadmode.js to automatically
            // load a mode. (Preferred mechanism is the require/define calls.)
            CodeMirror.defineMode = function (name/*, mode, …*/) {
                if (!CodeMirror.defaults.mode && name != "null") {
                    CodeMirror.defaults.mode = name;
                }
                defineMode.apply(this, arguments);
            };

            CodeMirror.defineMIME = defineMIME;

            // Minimal default mode.
            CodeMirror.defineMode("null", function () {
                return ({
                    token: function (stream) {
                        return stream.skipToEnd();
                    }
                });
            });
            CodeMirror.defineMIME("text/plain", "null");

            // EXTENSIONS

            CodeMirror.defineExtension = function (name, func) {
                CodeMirror.prototype[name] = func;
            };
            CodeMirror.defineDocExtension = function (name, func) {
                Doc.prototype[name] = func;
            };

            CodeMirror.fromTextArea = fromTextArea;

            addLegacyProps(CodeMirror);

            CodeMirror.version = "5.41.0";

            return CodeMirror;

        })));
    })(jQuery);
    layui.config({
        base: basePath + '../../lib/layui/lay/modules/codemirror/'
    }).use(['formatting']);
    exports('codemirror', null);
});
